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Fix segfault when converting files w/out alpha
Patch by Andy Chambers
http://bugs.gentoo.org/104434
--- converter/other/pnmtopng.c
+++ converter/other/pnmtopng.c
@@ -1690,7 +1690,8 @@
pnm_promoteformatrow(xelrow, cols, maxval, format, maxval,
PPM_TYPE);
- makePngLine(line, xelrow, cols, maxval, alpha, alpha_mask[row],
+ makePngLine(line, xelrow, cols, maxval,
+ alpha, alpha ? alpha_mask[row] : NULL,
cht, caht, info_ptr, png_maxval, depth);
png_write_row(png_ptr, line);
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