rxrpc_alloc_connection() doesn't return an error code on failure, it just
returns NULL.  IS_ERR(NULL) is false.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>