gstrtspsrc: Don't emit error during close if server is EOF

During a graceful close we try to notify the server that we're
finished. There is no reason to consider it an error if the
server has already closed the connection.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9278>

subprojects/gst-plugins-good/gst/rtsp/gstrtspsrc.c

@@ -7246,6 +7246,9 @@ again:
 
 send_error:
   {
+    if (src->busy_cmd == CMD_CLOSE && res == GST_RTSP_EEOF)
+      return res;
+
     gchar *str = gst_rtsp_strresult (res);
 
     if (res != GST_RTSP_EINTR) {
@@ -9279,6 +9282,9 @@ create_request_failed:
   }
 send_error:
   {
+    if (res == GST_RTSP_EEOF)
+      goto close;
+
     gchar *str = gst_rtsp_strresult (res);
 
     gst_rtsp_message_unset (&request);