landlock/audit: Fix wrong type usage

I think, based on my best understanding, that this type is likely a typo
(even though in the end both are u16)

Signed-off-by: Tingmao Wang <[email protected]>
Fixes: 2fc80c6 ("landlock: Log file-related denials")
---

Changes since v1:
- Added Fixes tag

Author: micromaomao

security/landlock/audit.c

@@ -191,7 +191,7 @@ static size_t get_denied_layer(const struct landlock_ruleset *const domain,
 	long youngest_layer = -1;
 
 	for_each_set_bit(access_bit, &access_req, layer_masks_size) {
-		const access_mask_t mask = (*layer_masks)[access_bit];
+		const layer_mask_t mask = (*layer_masks)[access_bit];
 		long layer;
 
 		if (!mask)