UBIFS: remove douple initialization in change_category()

"heap" is initialized twice.  I removed the first one, because it makes
Smatch complain that we use "new_cat" as an offset before checking it.

This doesn't change how the code works, it's just a cleanup.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

fs/ubifs/lprops.c

@@ -447,7 +447,7 @@ static void change_category(struct ubifs_info *c, struct ubifs_lprops *lprops)
 	int new_cat = ubifs_categorize_lprops(c, lprops);
 
 	if (old_cat == new_cat) {
-		struct ubifs_lpt_heap *heap = &c->lpt_heap[new_cat - 1];
+		struct ubifs_lpt_heap *heap;
 
 		/* lprops on a heap now must be moved up or down */
 		if (new_cat < 1 || new_cat > LPROPS_HEAP_CNT)