Fixed various memory leaks

Below are few of the valgrind outputs:
==2694== 7,484 (576 direct, 6,908 indirect) bytes in 72 blocks are definitely lost in loss record 196 of 197
==2694==    at 0x48458A4: malloc (vg_replace_malloc.c:299)
==2694==    by 0x48C11B3: g_malloc (gmem.c:94)
==2694==    by 0x48DA4A3: g_slice_alloc (gslice.c:1025)
==2694==    by 0x48DBA13: g_slist_append (gslist.c:213)
==2694==    by 0x12EF29: g_supplicant_network_get_wifi_vsie(supplicant.c:1605)
==2694==    by 0x127097: network_added (wifi.c:3447)
==2694==    by 0x12A41D: callback_network_added (supplicant.c:624)
==2694==    by 0x12A41D: add_or_replace_bss_to_network(supplicant.c:1967)
==2694==    by 0x12B9C9: interface_bss_added_with_keys(supplicant.c:2457)
==2694==    by 0x12B9C9: signal_bss_added (supplicant.c:3106)
==2694==    by 0x12AF1D: g_supplicant_filter (supplicant.c:4045)
==2694==    by 0x49904EB: dbus_connection_dispatch (in/usr/lib/libdbus-1.so.3.14.6)
==2694==    by 0x18E921: message_dispatch (mainloop.c:76)
==2694==    by 0x48BB8E7: g_main_dispatch (gmain.c:3234)
==2694==    by 0x48BB8E7: g_main_context_dispatch (gmain.c:3887)

==2694== 1,980 (304 direct, 1,676 indirect) bytes in 38 blocks are definitely lost in loss record 187 of 197
==2694==    at 0x48458A4: malloc (vg_replace_malloc.c:299)
==2694==    by 0x48C11B3: g_malloc (gmem.c:94)
==2694==    by 0x48DA4A3: g_slice_alloc (gslice.c:1025)
==2694==    by 0x48DBA13: g_slist_append (gslist.c:213)
==2694==    by 0x128D3F: update_bssid_list (supplicant.c:1637)
==2694==    by 0x48A989F: g_hash_table_foreach (ghash.c:1610)
==2694==    by 0x12EF91: g_supplicant_network_get_bssid_list(supplicant.c:1649)
==2694==    by 0x127177: network_added (wifi.c:3489)
==2694==    by 0x1294D5: callback_network_added (supplicant.c:624)
==2694==    by 0x1294D5: scan_network_update (supplicant.c:2810)
==2694==    by 0x130151: supplicant_dbus_array_foreach (dbus.c:106)
==2694==    by 0x1298E3: scan_bss_data (supplicant.c:2824)
==2694==    by 0x130071: property_get_reply (dbus.c:273)

==2694== 28 bytes in 2 blocks are definitely lost in loss record 87 of 197
==2694==    at 0x48458A4: malloc (vg_replace_malloc.c:299)
==2694==    by 0x48C11B3: g_malloc (gmem.c:94)
==2694==    by 0x48DBF03: g_strdup (gstrfuncs.c:363)
==2694==    by 0x12A65B: merge_network (supplicant.c:1737)
==2694==    by 0x12A7D9: network_property (supplicant.c:1758)
==2694==    by 0x12A7D9: interface_network_added (supplicant.c:1808)
==2694==    by 0x12AF1D: g_supplicant_filter (supplicant.c:4045)
==2694==    by 0x49904EB: dbus_connection_dispatch (in /usr/lib/libdbus-1.so.3.14.6)
==2694==    by 0x18E921: message_dispatch (mainloop.c:76)
==2694==    by 0x48BB8E7: g_main_dispatch (gmain.c:3234)
==2694==    by 0x48BB8E7: g_main_context_dispatch (gmain.c:3887)
==2694==    by 0x48BBC77: g_main_context_iterate.isra.30 (gmain.c:3960)
==2694==    by 0x48BBFD7: g_main_loop_run (gmain.c:4156)
==2694==    by 0x119391: main (main.c:851)

Change-Id: I3d86724c44b1593e5444a65eb7519bc150e50ee5
Signed-off-by: Saurav Babu <saurav.babu@samsung.com>

2 files changed, 10 insertions, 2 deletions

diff --git a/src/network.c b/src/network.c
index c5b5c974..e189955c 100755
--- a/src/network.c
+++ b/src/network.c
@@ -2105,6 +2105,7 @@ unsigned char *connman_network_get_countrycode(struct connman_network *network)
 int connman_network_set_bssid_list(struct connman_network *network,
 					GSList *bssids)
 {
+	g_slist_free_full(network->wifi.bssid_list, g_free);
 	network->wifi.bssid_list = bssids;
 
 	return 0;
@@ -2439,6 +2440,7 @@ bool connman_network_get_bool(struct connman_network *network,
  */
 void connman_network_set_vsie_list(struct connman_network *network, GSList *vsie_list)
 {
+	g_slist_free_full(network->wifi.vsie_list, g_free);
 	network->wifi.vsie_list = vsie_list;
 }
 
diff --git a/src/service.c b/src/service.c
index b0424618..cf8ccaac 100755
--- a/src/service.c
+++ b/src/service.c
@@ -786,11 +786,17 @@ static int service_load(struct connman_service *service)
 
 	dns_method = g_key_file_get_string(keyfile, service->identifier,
 			"Nameservers.IPv4method", NULL);
-	service->dns_config_method_ipv4 = __connman_dnsconfig_string2method(dns_method);
+	if (dns_method) {
+		service->dns_config_method_ipv4 = __connman_dnsconfig_string2method(dns_method);
+		g_free(dns_method);
+	}
 
 	dns_method = g_key_file_get_string(keyfile, service->identifier,
 			"Nameservers.IPv6method", NULL);
-	service->dns_config_method_ipv6 = __connman_dnsconfig_string2method(dns_method);
+	if (dns_method) {
+		service->dns_config_method_ipv6 = __connman_dnsconfig_string2method(dns_method);
+		g_free(dns_method);
+	}
 #endif
 
 	service->timeservers_config = g_key_file_get_string_list(keyfile,