net: remove clear_sk() method

We no longer use this handler, we can delete it.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/sock.c b/net/core/sock.c
index 2b09c29..51a7304 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1326,12 +1326,8 @@
 		sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
 		if (!sk)
 			return sk;
-		if (priority & __GFP_ZERO) {
-			if (prot->clear_sk)
-				prot->clear_sk(sk, prot->obj_size);
-			else
-				sk_prot_clear_nulls(sk, prot->obj_size);
-		}
+		if (priority & __GFP_ZERO)
+			sk_prot_clear_nulls(sk, prot->obj_size);
 	} else
 		sk = kmalloc(prot->obj_size, priority);