constify drive_get_by_id arg

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Message-Id: 

1 files changed, 1 insertions, 1 deletions

diff --git a/sysemu.h b/sysemu.h
index c7065ac038..ca25015390 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -176,7 +176,7 @@ extern TAILQ_HEAD(drivelist, DriveInfo) drives;
 extern TAILQ_HEAD(driveoptlist, DriveOpt) driveopts;
 
 extern DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
-extern DriveInfo *drive_get_by_id(char *id);
+extern DriveInfo *drive_get_by_id(const char *id);
 extern int drive_get_max_bus(BlockInterfaceType type);
 extern void drive_uninit(BlockDriverState *bdrv);
 extern const char *drive_get_serial(BlockDriverState *bdrv);