[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/atm/common.c b/net/atm/common.c
index e166d9e..eba09a0 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -133,7 +133,7 @@
 	sock->sk = NULL;
 	if (sock->type == SOCK_STREAM)
 		return -EINVAL;
-	sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, 1);
+	sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
 	if (!sk)
 		return -ENOMEM;
 	sock_init_data(sock, sk);