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6c: return vlong result for pointer subtraction

--- a/sys/src/cmd/cc/sub.c

+++ b/sys/src/cmd/cc/sub.c

@@ -692,14 +692,6 @@

 		if(w < 1 || n->left->type->link == T || n->left->type->link->width < 1)

 			goto bad;

 		n->type = types[ewidth[TIND] <= ewidth[TLONG]? TLONG: TVLONG];

-		if(1 && ewidth[TIND] > ewidth[TLONG]){

-			n1 = new1(OXXX, Z, Z);

-			*n1 = *n;

-			n->op = OCAST;

-			n->left = n1;

-			n->right = Z;

-			n->type = types[TLONG];

-		}

 		if(w > 1) {

 			n1 = new1(OXXX, Z, Z);

 			*n1 = *n;

@@ -714,6 +706,14 @@

 				n->op = OASHR;

 				n1->vconst = w;

 			}

+		}

+		if(0 && ewidth[TIND] > ewidth[TLONG]){

+			n1 = new1(OXXX, Z, Z);

+			*n1 = *n;

+			n->op = OCAST;

+			n->left = n1;

+			n->right = Z;

+			n->type = types[TLONG];

 		}

 		return;

 	}