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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 767998
           Summary: tautological-compare warnings/errors when building
                    tests with recent GCC
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gdesmott at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I updated to Fedora 24 (gcc 6.1.1) and get those warnings (handled as errors)
when running "make check".

gst/gstinfo.c: In function ‘info_ptr_format_printf_extension’:
gst/gstinfo.c:59:26: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   gst_debug_remove_log_function (gst_debug_log_default);
                          ^~
gst/gstinfo.c:134:33: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   gst_debug_add_log_function (gst_debug_log_default, NULL, NULL);
                                 ^~
gst/gstinfo.c: In function ‘info_segment_format_printf_extension’:
gst/gstinfo.c:145:26: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   gst_debug_remove_log_function (gst_debug_log_default);
                          ^~
gst/gstinfo.c:212:33: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   gst_debug_add_log_function (gst_debug_log_default, NULL, NULL);
                                 ^~
gst/gstinfo.c: In function ‘info_log_handler’:
gst/gstinfo.c:222:36: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   removed = gst_debug_remove_log_function (gst_debug_log_default);
                                    ^~
gst/gstinfo.c: In function ‘info_old_printf_extensions’:
gst/gstinfo.c:292:26: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   gst_debug_remove_log_function (gst_debug_log_default);
                          ^~
gst/gstinfo.c:327:33: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
   gst_debug_add_log_function (gst_debug_log_default, NULL, NULL);
                                 ^~
cc1: all warnings being treated as errors
Makefile:2469: recipe for target 'gst/gstinfo.o' failed

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