[Bug 767998] tautological-compare warnings/errors when building tests with recent GCC

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767998

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Looks like it's because of this:
https://cgit.freedesktop.org/gstreamer/gstreamer/tree/gst/gstinfo.h#n427

#define gst_debug_remove_log_function(func)   \
    (func == gst_debug_log_default) ?         \
        gst_debug_remove_log_function(NULL) : \
        gst_debug_remove_log_function(func)

What's the point of this macro exactly? We have the same the same logic
implemented in the function:

  if (func == NULL)
    func = gst_debug_log_default;

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