apng: use correct size for output buffer
The buffer needs s->bpp bytes, at maximum currently 10. Assert that s->bpp is not larger. This fixes a stack buffer overflow. Reviewed-by:wm4 <nfxjfg@googlemail.com> Reviewed-by:
Paul B Mahol <onemda@gmail.com> Signed-off-by:
Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
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