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nalutils: Improve slightly the error trace

Nicolas Dufresne requested to merge ndufresne/gst-plugins-bad:h264parser-debug-enhancement into master

Until now, bound check would simply trace the values and the range. This enhances the trace by also tracing the name of the variable that was to be set or read. This is not magically perfect in all cases, but greatly speed the debugging work. Here's an example before and after this change:

Before: gst_h264_parser_parse_slice_hdr: value not in allowed range. value: 819183, range -87-77
After:  gst_h264_parser_parse_slice_hdr: value for 'slice->slice_qp_delta' not in allowed range. value: 819183, range -87-77
Edited by Nicolas Dufresne

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