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tif: initialize max to one instead of zero for palette rescaling in case all values are zero.

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

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

@@ -1290,7 +1290,7 @@

 	pmask = (1 << t->depth) - 1;

 	xmask = 7 >> log2[t->depth];

-	for(i = max = 0; i < t->ncolor; i++) {

+	for(i = 0, max = 1; i < t->ncolor; i++) {

 		if(t->color[i] > max)

 			max = t->color[i];

 	}

-- 

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