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libmemdraw: apply erik quanstros fix for sign preserving in byteaddr()

--- a/sys/src/libmemdraw/alloc.c

+++ b/sys/src/libmemdraw/alloc.c

@@ -143,8 +143,7 @@

 {

 	uchar *a;

-	a = i->data->bdata+i->zero+sizeof(ulong)*p.y*i->width;

-

+	a = i->data->bdata+i->zero+(int)(sizeof(ulong)*p.y*i->width);

 	if(i->depth < 8){

 		/*

 		 * We need to always round down,