inet fragments: fix sparse warning: context imbalance

Impact: Attribute function with __releases(...)

Fix this sparse warning:
  net/ipv4/inet_fragment.c:276:35: warning: context imbalance in 'inet_frag_find' - unexpected unlock
Signed-off-by: NHannes Eder <hannes@hanneseder.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -61,7 +61,8 @@ void inet_frag_destroy(struct inet_frag_queue *q,
 				struct inet_frags *f, int *work);
 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
-		struct inet_frags *f, void *key, unsigned int hash);
+		struct inet_frags *f, void *key, unsigned int hash)
+	__releases(&f->lock);
 
 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
 {

net/ipv4/inet_fragment.c

@@ -267,6 +267,7 @@ static struct inet_frag_queue *inet_frag_create(struct netns_frags *nf,
 
 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
 		struct inet_frags *f, void *key, unsigned int hash)
+	__releases(&f->lock)
 {
 	struct inet_frag_queue *q;
 	struct hlist_node *n;