ubifs: Remove redundant assignment to pointer fname

The pointer fname is being assigned with a value that is never
read because the function returns after the assignment. The assignment
is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/debug.c

@@ -2817,7 +2817,6 @@ void dbg_debugfs_init_fs(struct ubifs_info *c)
 		     c->vi.ubi_num, c->vi.vol_id);
 	if (n == UBIFS_DFS_DIR_LEN) {
 		/* The array size is too small */
-		fname = UBIFS_DFS_DIR_NAME;
 		return;
 	}