[media] media: Use all bits of an enumeration

The allocation takes place in longs. Assign the size of the enum
accordingly.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/media-entity.c

@@ -73,8 +73,9 @@ static inline const char *intf_type(struct media_interface *intf)
 __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
 					  int idx_max)
 {
-	ent_enum->bmap = kcalloc(DIV_ROUND_UP(idx_max, BITS_PER_LONG),
-				 sizeof(long), GFP_KERNEL);
+	idx_max = ALIGN(idx_max, BITS_PER_LONG);
+	ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long),
+				 GFP_KERNEL);
 	if (!ent_enum->bmap)
 		return -ENOMEM;