net: core: drop null test before destroy functions

Remove unneeded NULL test.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@ expression x; @@
-if (x != NULL) {
  \(kmem_cache_destroy\|mempool_destroy\|dma_pool_destroy\)(x);
  x = NULL;
-}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 8 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index ca2984afe16e..3307c02244d3 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2740,10 +2740,8 @@ static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
                 return;
         kfree(rsk_prot->slab_name);
         rsk_prot->slab_name = NULL;
-        if (rsk_prot->slab) {
-                kmem_cache_destroy(rsk_prot->slab);
-                rsk_prot->slab = NULL;
-        }
+        kmem_cache_destroy(rsk_prot->slab);
+        rsk_prot->slab = NULL;
 }
 
 static int req_prot_init(const struct proto *prot)
@@ -2828,10 +2826,8 @@ void proto_unregister(struct proto *prot)
         list_del(&prot->node);
         mutex_unlock(&proto_list_mutex);
 
-        if (prot->slab != NULL) {
-                kmem_cache_destroy(prot->slab);
-                prot->slab = NULL;
-        }
+        kmem_cache_destroy(prot->slab);
+        prot->slab = NULL;
 
         req_prot_cleanup(prot->rsk_prot);