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cs: initialize color when color space is set

--- a/op.c

+++ b/op.c

@@ -364,6 +364,7 @@

 cspace(Op *op, Page *p)

 {

 	ColorSpace *c = (op->flags & Nonstroking) ? &p->GSactive->NSCS : &p->GSactive->SCS;

+	u32int *color = (op->flags & Nonstroking) ? &p->GSactive->NSC : &p->GSactive->SC;

 	char *s = arrayget(p->stack, 0)->name;

 	Object *o;

 	int i;

@@ -370,6 +371,7 @@

 	for(i = 0; i < 3; i += 1)

 		if(strcmp(s, colorspacedevices[i]) == 0){

 			*c = i;

+			*color = i == 2 ? 0xFF : 0;

 			return 1;

 		}

 	if((o = dictget(dictget(p->obj, "Resources"), "ColorSpace")) == &null

@@ -380,7 +382,10 @@

 	if(strcmp(arrayget(o, 0)->name, "ICCBased") == 0){

 		/* Don't support ICC; fall back to Alternate or default */

 		o = arrayget(o, 1);

-		return iccbasedcspace(o, c);

+		if(!iccbasedcspace(o, c))

+			return 0;

+		*color = *c == 2 ? 0xFF : 0;

+		return 1;

 	}

 	werrstr("cspace: TODO: %s color space", arrayget(o, 0)->name);

 	return 0;