UBI: remove dead code

Thanks to new gcc 4.6 for issuing the following warning:

drivers/mtd/ubi/vtbl.c: In function ‘create_vtbl’:
drivers/mtd/ubi/vtbl.c:311:33: warning: variable ‘old_seb’ set but not used [-Wunused-but-set-variable]

This patch removes some dead code and fixes the warning.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

drivers/mtd/ubi/vtbl.c

@@ -307,8 +307,7 @@ static int create_vtbl(struct ubi_device *ubi, struct ubi_scan_info *si,
 {
 	int err, tries = 0;
 	static struct ubi_vid_hdr *vid_hdr;
-	struct ubi_scan_volume *sv;
-	struct ubi_scan_leb *new_seb, *old_seb = NULL;
+	struct ubi_scan_leb *new_seb;
 
 	ubi_msg("create volume table (copy #%d)", copy + 1);
 
@@ -316,15 +315,6 @@ static int create_vtbl(struct ubi_device *ubi, struct ubi_scan_info *si,
 	if (!vid_hdr)
 		return -ENOMEM;
 
-	/*
-	 * Check if there is a logical eraseblock which would have to contain
-	 * this volume table copy was found during scanning. It has to be wiped
-	 * out.
-	 */
-	sv = ubi_scan_find_sv(si, UBI_LAYOUT_VOLUME_ID);
-	if (sv)
-		old_seb = ubi_scan_find_seb(sv, copy);
-
 retry:
 	new_seb = ubi_scan_get_free_peb(ubi, si);
 	if (IS_ERR(new_seb)) {
@@ -351,8 +341,8 @@ static int create_vtbl(struct ubi_device *ubi, struct ubi_scan_info *si,
 		goto write_error;
 
 	/*
-	 * And add it to the scanning information. Don't delete the old
-	 * @old_seb as it will be deleted and freed in 'ubi_scan_add_used()'.
+	 * And add it to the scanning information. Don't delete the old version
+	 * of this LEB as it will be deleted and freed in 'ubi_scan_add_used()'.
 	 */
 	err = ubi_scan_add_used(ubi, si, new_seb->pnum, new_seb->ec,
 				vid_hdr, 0);