[Bug 755161] New: h264parse: initialize slice group id earlier

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755161

            Bug ID: 755161
           Summary: h264parse: initialize slice group id earlier
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vjaquez at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When calling gst_h264_parse_pps() the function may fail when it calls
gst_h264_parser_get_sps(), leaving unitialised the variable
slice_group_id.  This situation may lead to a segmentation fault when calling
gst_h264_pps_clear().

Setting slice_group_id to NULL before calling gst_h264_parser_get_sps() avoids
this potential segmentation fault.

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