rpmsg: fix rpmsg_virtio_get_tx_payload_buffer error

If rpmsg_virtio_notify_wait returns RPMSG_SUCCESS, we don't call
rpmsg_virtio_get_tx_buffer.

Signed-off-by: Yongrong Wang <[email protected]>
Signed-off-by: Bowen Wang <[email protected]>

Author: wyr-7

lib/rpmsg/rpmsg_virtio.c

@@ -393,9 +393,8 @@ static void *rpmsg_virtio_get_tx_payload_buffer(struct rpmsg_device *rdev,
 		if (status == RPMSG_EOPNOTSUPP) {
 			metal_sleep_usec(RPMSG_TICKS_PER_INTERVAL);
 			tick_count--;
-		} else if (status == RPMSG_SUCCESS) {
+		} else if (status != RPMSG_SUCCESS)
 			break;
-		}
 	}
 
 	if (!rp_hdr)