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/vl.c b/vl.c
index 6c4a509989..d82c3d84d2 100644
--- a/vl.c
+++ b/vl.c
@@ -1835,7 +1835,7 @@ DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
     return NULL;
 }
 
-DriveInfo *drive_get_by_id(char *id)
+DriveInfo *drive_get_by_id(const char *id)
 {
     DriveInfo *dinfo;