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Bug 690723 : Prevent over writing unallocated memory when parsing an image

--- a/jbig2_mmr.c

+++ b/jbig2_mmr.c

@@ -790,7 +790,7 @@

 		line[a0] |= lm[b0];

 		for (a = a0 + 1; a < a1; a++)

 			line[a] = 0xFF;

-		line[a1] |= rm[b1];

+		if (b1) line[a1] |= rm[b1];

 	}

 }