netlink-socket: return correct error code when connect fails

When connect and other calls fail after get_socket_rcvbuf, the return code would
be the rcvbuf size, not errno from the last call.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>

lib/netlink-socket.c

@@ -139,6 +139,7 @@ nl_sock_create(int protocol, struct nl_sock **sockp)
         goto error;
     }
     sock->rcvbuf = retval;
+    retval = 0;
 
     /* Connect to kernel (pid 0) as remote address. */
     memset(&remote, 0, sizeof remote);