net: Check subnet against the actual ip address in use for nfs

The check for sending to the gateway was not using the correct variable
for comparison, so it was reporting that packets are sent to the gateway
when they were not.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

net/nfs.c

@@ -896,7 +896,7 @@ void nfs_start(void)
 		struct in_addr server_net;
 
 		our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
-		server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
+		server_net.s_addr = nfs_server_ip.s_addr & net_netmask.s_addr;
 		if (our_net.s_addr != server_net.s_addr)
 			debug("; sending through gateway %pI4",
 			      &net_gateway);