lib/os/heap: no need to over-mask

bmask already represents the intersection of h->avail_buckets and
wanted buckets.

Signed-off-by: Nicolas Pitre <[email protected]>

Author: Nicolas Pitre

lib/os/heap.c

@@ -207,8 +207,8 @@ static chunkid_t alloc_chunk(struct z_heap *h, size_t sz)
 	 */
 	size_t bmask = h->avail_buckets & ~((1 << (bi + 1)) - 1);
 
-	if ((bmask & h->avail_buckets) != 0U) {
-		int minbucket = __builtin_ctz(bmask & h->avail_buckets);
+	if (bmask != 0U) {
+		int minbucket = __builtin_ctz(bmask);
 		chunkid_t c = h->buckets[minbucket].next;
 
 		free_list_remove_bidx(h, c, minbucket);