cmd/gc, cmd/ld: fix build: remove unused var, use correct var in printf

Fixes #5924.

R=golang-dev, khr, rsc
CC=golang-dev
https://golang.org/cl/11606043

src/cmd/gc/pgen.c

@@ -17,7 +17,7 @@ compile(Node *fn)
 {
 	Plist *pl;
 	Node nod1, *n, *gcnod;
-	Prog *pfuncdata, *ptxt, *p, *p1;
+	Prog *ptxt, *p, *p1;
 	int32 lno;
 	Type *t;
 	Iter save;
@@ -99,7 +99,7 @@ compile(Node *fn)
 	gcnod->class = PEXTERN;
 
 	nodconst(&nod1, types[TINT32], FUNCDATA_GC);
-	pfuncdata = gins(AFUNCDATA, &nod1, gcnod);
+	gins(AFUNCDATA, &nod1, gcnod);
 
 	for(t=curfn->paramfld; t; t=t->down)
 		gtrack(tracksym(t->type));

src/cmd/ld/lib.c

@@ -2458,7 +2458,7 @@ pclntab(void)
 		for(p = cursym->text; p != P; p = p->link) {
 			if(p->as == AFUNCDATA) {
 				if((havefunc[p->from.offset/32]>>(p->from.offset%32))&1)
-					diag("multiple definitions for FUNCDATA $%d", i);
+					diag("multiple definitions for FUNCDATA $%d", p->from.offset);
 				havefunc[p->from.offset/32] |= 1<<(p->from.offset%32);
 			}
 			if(p->as == APCDATA)