[Bug 797007] Warning log printed when running glvideomixer command

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797007

--- Comment #1 from Qi Hou <qi.hou at nxp.com> ---
Created attachment 373424
  --> https://bugzilla.gnome.org/attachment.cgi?id=373424&action=edit
Check whether g_signal_handler_is_connected() as well as deal with the mutiple
thread situation.

The patch is the solution provided for the submitted bug.

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