shithub: riscv

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topng: fix bug causing bogus double insertion of filter alg byte

--- a/sys/src/cmd/jpg/writepng.c

+++ b/sys/src/cmd/jpg/writepng.c

@@ -79,7 +79,7 @@

 	pixwid = z->pixwid;

 	b = buf;

 	e = b+n;

-	while(b+pixwid <= e){

+	while(b+pixwid < e){	/* one less for filter alg byte */

 		if(z->y >= z->dy)

 			break;

 		if(z->x == 0)