Fix out-of-bounds write in gzungetc() - #1290
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Signed-off-by: mapengyuan <mapengyuan@xfusion.com>
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Fix an out-of-bounds write in
gzungetc()when the output buffer state is invalid.Add a guard for the empty-output-buffer path to return
-1ifstate->out == NULLorstate->size == 0.Fixes #1289.