rxrpc: Move the call completion handling out of line

Move the handling of call completion out of line so that the next patch can
add more code in that area.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>

net/rxrpc/sendmsg.c

@@ -261,10 +261,10 @@ static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
 		case -ENETUNREACH:
 		case -EHOSTUNREACH:
 		case -ECONNREFUSED:
-			rxrpc_set_call_completion(call,
-						  RXRPC_CALL_LOCAL_ERROR,
-						  0, ret);
-			rxrpc_notify_socket(call);
+			if (rxrpc_set_call_completion(call,
+						      RXRPC_CALL_LOCAL_ERROR,
+						      0, ret))
+				rxrpc_notify_socket(call);
 			goto out;
 		}
 		_debug("need instant resend %d", ret);