rpmsg_socket: release tx buffer when send_oncopy failed

Signed-off-by: ligd <liguiding1@xiaomi.com>

net/rpmsg/rpmsg_sockif.c

@@ -1010,6 +1010,7 @@ static ssize_t rpmsg_socket_send_continuous(FAR struct socket *psock,
                                 conn->ept.dest_addr);
       if (ret < 0)
         {
+          rpmsg_release_tx_buffer(&conn->ept, msg);
           break;
         }
 
@@ -1109,6 +1110,10 @@ static ssize_t rpmsg_socket_send_single(FAR struct socket *psock,
   nxmutex_unlock(&conn->sendlock);
 
   ret = rpmsg_sendto_nocopy(&conn->ept, msg, total, conn->ept.dest_addr);
+  if (ret < 0)
+    {
+      rpmsg_release_tx_buffer(&conn->ept, msg);
+    }
 
   return ret > 0 ? len : ret;
 }