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7c: node offsets aren't necessarily 0 - fixup packed structs

--- a/sys/src/cmd/7c/cgen.c

+++ b/sys/src/cmd/7c/cgen.c

@@ -1121,7 +1121,8 @@

 	}

 	if((m = w % SZ_LONG) > 0){

-		nod1.xoffset = nod2.xoffset = w - m;

+		nod1.xoffset += w - m;

+		nod2.xoffset += w - m;

 		regalloc(&nod3, &regnode, Z);

 		do{

 			gins(AMOVB, &nod1, &nod3);

@@ -1128,10 +1129,11 @@

 			gins(AMOVB, &nod3, &nod2);

 			nod1.xoffset++;

 			nod2.xoffset++;

+			w--;

 		}while(--m > 0);

 		regfree(&nod3);

-		nod1.xoffset = 0;

-		nod2.xoffset = 0;

+		nod1.xoffset -= w - m;

+		nod2.xoffset -= w - m;

 	}

 	w /= SZ_LONG;