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Merge later releases 1.89, 1.90, 1.91 #10
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Avoid valgrind warnings.
If a compressed image contains errors, don't use it for output. This reduces repeated error messages for bad image data, and makes gifsicle's output better than its input.
Tim Strazzere report. Also fixed by a0a3651.
Fix #115, #116 issues reported by Zhao Liang, Huawei Weiran Labs.
With a non-malicious GIF, last_name is set to NULL when a name extension is followed by an image. Reported in #117, via Debian, via a KAIST fuzzing program.
Another KAIST report; we null-dereferenced previously.
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