GCC4.6: Squash warning in vmt.c

vmt.c: In function ‘ubi_free_volume’:
vmt.c:681:6: warning: variable ‘err’ set but not used
[-Wunused-but-set-variable]

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>

drivers/mtd/ubi/ubi.h

@@ -467,7 +467,12 @@ int ubi_destroy_gluebi(struct ubi_volume *vol);
 void ubi_gluebi_updated(struct ubi_volume *vol);
 #else
 #define ubi_create_gluebi(ubi, vol) 0
-#define ubi_destroy_gluebi(vol) 0
+
+static inline int ubi_destroy_gluebi(struct ubi_volume *vol)
+{
+	return 0;
+}
+
 #define ubi_gluebi_updated(vol)
 #endif
 

drivers/mtd/ubi/vmt.c

@@ -678,12 +678,10 @@ out_cdev:
  */
 void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol)
 {
-	int err;
-
 	dbg_msg("free volume %d", vol->vol_id);
 
 	ubi->volumes[vol->vol_id] = NULL;
-	err = ubi_destroy_gluebi(vol);
+	ubi_destroy_gluebi(vol);
 	cdev_del(&vol->cdev);
 	volume_sysfs_close(vol);
 }