sk-inet: if a source port isn't zero, a socket should be bound (v2)

Now crtools checks address, but it may be zero. For example,
a listen socket is bound to zero address to accept connections
from any addresses.

v2: add a comment about zero port
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

sk-inet.c

@@ -279,12 +279,10 @@ int inet_collect_one(struct nlmsghdr *h, int family, int type, int proto)
 	return ret;
 }
 
-static u32 zero_addr[4];
-
 static bool is_bound(struct inet_sk_info *ii)
 {
-	return memcmp(zero_addr, ii->ie->src_addr, pb_repeated_size(ii->ie, src_addr)) ||
-	       memcmp(zero_addr, ii->ie->dst_addr, pb_repeated_size(ii->ie, dst_addr));
+	/* zero port is reserved */
+	return ii->ie->src_port;
 }