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cgraph: fix duplicate 'va_end' calls in error functions

Matthew Fernandez requested to merge smattr/graphviz:smattr/8b7a8143-3db0-426c-87fd-e053cba08759 into main

All of 24ff810a, b26419ad, and the pre-version-control revision of Graphviz seem to have failed to notice the callers of agerr_va handle destructing the va_list. This probably caused no problems only because va_end is a no-op on many platforms.

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