size CompBuffer for dot-matrix expansion in rastertoepson#1613
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OutputLine writes one byte per pixel column (cupsWidth) into CompBuffer while StartPage only sized it for cupsBytesPerLine, so a wide low-bpp page sent to a dot-matrix queue overran the heap allocation.
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size CompBuffer for the dot-matrix path in OutputLine, which writes one byte per pixel (cupsWidth) into a buffer StartPage only sized for the compressed line (cupsBytesPerLine), so a wide 1-bit page on a 9-pin/24-pin queue overruns the heap allocation by roughly three quarters of cupsWidth.