coccinelle: make use of SYNTHETIC_ERRNO

Ideally, coccinelle would strip unnecessary braces too. But I do not see any
option in coccinelle for this, so instead, I edited the patch text using
search&replace to remove the braces. Unfortunately this is not fully automatic,
in particular it didn't deal well with if-else-if-else blocks and ifdefs, so
there is an increased likelikehood be some bugs in such spots.

I also removed part of the patch that coccinelle generated for udev, where we
returns -1 for failure. This should be fixed independently.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/shared/bus-util.c b/src/shared/bus-util.c
index 4667d3bc52..760be38c85 100644
--- a/src/shared/bus-util.c
+++ b/src/shared/bus-util.c
@@ -1382,12 +1382,10 @@ int bus_connect_transport_systemd(BusTransport transport, const char *host, bool
                 if (user)
                         r = bus_connect_user_systemd(bus);
                 else {
-                        if (sd_booted() <= 0) {
+                        if (sd_booted() <= 0)
                                 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
-                                log_error("System has not been booted with systemd as init system (PID 1). Can't operate.");
-
-                                return -EHOSTDOWN;
-                        }
+                                return log_error_errno(SYNTHETIC_ERRNO(EHOSTDOWN),
+                                                       "System has not been booted with systemd as init system (PID 1). Can't operate.");
                         r = bus_connect_system_systemd(bus);
                 }
                 break;