connection: don't error when not enough data

When there is not enough data available yet, don't fail but try again
next time.

src/modules/module-protocol-native/connection.c

@@ -144,7 +144,7 @@ static bool refill_buffer(struct pw_protocol_native_connection *conn, struct buf
 		if (len < 0) {
 			if (errno == EINTR)
 				continue;
-			else
+			if (errno != EAGAIN || errno != EWOULDBLOCK)
 				goto recv_error;
 		}
 		break;