Fix unused function warnings

v2: Remove the handler function instead of commenting out
    split debugmsg function removal to a separate patch

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/xf86drm.c b/xf86drm.c
index 051ed5d..43d0700 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -277,6 +277,7 @@
  * If any other failure happened then it will output error mesage using
  * drmMsg() call.
  */
+#if !defined(UDEV)
 static int chown_check_return(const char *path, uid_t owner, gid_t group)
 {
 	int rv;
@@ -292,6 +293,7 @@
 			path, errno, strerror(errno));
 	return -1;
 }
+#endif
 
 /**
  * Open the DRM device, creating it if necessary.