[NET]: Forget the zero_it argument of sk_alloc()

Finally, the zero_it argument can be completely removed from
the callers and from the function prototype.

Besides, fix the checkpatch.pl warnings about using the
assignments inside if-s.

This patch is rather big, and it is a part of the previous one.
I splitted it wishing to make the patches more readable. Hope 
this particular split helped.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 509defe..ed2d65c 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -513,7 +513,8 @@
 	if (sock->type != SOCK_SEQPACKET || protocol != 0)
 		return -ESOCKTNOSUPPORT;
 
-	if ((sk = sk_alloc(net, PF_ROSE, GFP_ATOMIC, &rose_proto, 1)) == NULL)
+	sk = sk_alloc(net, PF_ROSE, GFP_ATOMIC, &rose_proto);
+	if (sk == NULL)
 		return -ENOMEM;
 
 	rose = rose_sk(sk);
@@ -551,7 +552,8 @@
 	if (osk->sk_type != SOCK_SEQPACKET)
 		return NULL;
 
-	if ((sk = sk_alloc(osk->sk_net, PF_ROSE, GFP_ATOMIC, &rose_proto, 1)) == NULL)
+	sk = sk_alloc(osk->sk_net, PF_ROSE, GFP_ATOMIC, &rose_proto);
+	if (sk == NULL)
 		return NULL;
 
 	rose = rose_sk(sk);