racket/draw: fix potential png bug
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@ -141,7 +141,7 @@
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(define-png png_write_end (_fun _png_structp _png_infop -> _void))
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(define-png png_get_valid (_fun _png_structp _png_infop _uint32 -> _uint32))
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(define-png png_get_bKGD (_fun _png_structp _png_infop (p : (_ptr o _png_color_16-pointer/null)) -> (r : _bool) -> (and r p)))
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(define-png png_get_bKGD (_fun _png_structp _png_infop (p : (_ptr o _png_color_16)) -> (r : _bool) -> (and r p)))
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(define-png png_set_background (_fun _png_structp _png_color_16-pointer _int _int _double* -> _bool))
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(define-png png_get_gAMA (_fun _png_structp _png_infop (g : (_ptr o _double))
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-> (ok? : _bool)
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