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op: properly initialize ctm

--- a/op.c

+++ b/op.c

@@ -727,7 +727,7 @@

  		return 0;

 	}

 	if(p->buf.b != nil)

-		memimagestring(p->image, Pt(Trm[4], 1100 - Trm[5]), memblack, Pt(0,0), getmemdefont(), (char*)p->buf.b + oend);

+		memimagestring(p->image, Pt(Trm[4], Trm[5]), memblack, Pt(0,0), getmemdefont(), (char*)p->buf.b + oend);

 	tx = glyphspacing(p, c);

 	mattrans(p->TS.Tm, tx, 0, p->TS.Tm);

 	p->TS.x = Trm[4] + tx;

@@ -1309,7 +1309,8 @@

 	mx = arrayget(cropbox, 2)->num.d;

 	my = arrayget(cropbox, 3)->num.d;

 	ctm[0] = 850 / mx;

-	ctm[3] = 1100 / my;

+	ctm[3] = -1100 / my;

+	ctm[5] = 1100;

 }

 void