code review 5651079: gc, 8g, 8l: fix a handful of warnings

src/cmd/gc/walk.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include        <u.h>
 #include        <libc.h>
 #include        "go.h"
 
 static  Node*   walkprint(Node*, NodeList**, int);
 static  Node*   mapfn(char*, Type*);
@@ skipping 1173 matching lines @@
                         r = nod(ONOT, r, N);
 ················
                 // check itable/type before full compare.
                 if(n->etype == OEQ)
                         r = nod(OANDAND, nod(OEQ, nod(OITAB, n->left, N), nod(OITAB, n->right, N)), r);
                 else
                         r = nod(OOROR, nod(ONE, nod(OITAB, n->left, N), nod(OITAB, n->right, N)), r);
                 typecheck(&r, Erv);
                 walkexpr(&r, nil);
 
-                n = r;
-                goto ret;
-
-········
                 n = r;
                 goto ret;
 
         case OARRAYLIT:
         case OMAPLIT:
         case OSTRUCTLIT:
         case OPTRLIT:
                 var = temp(n->type);
                 anylit(0, n, var, init);
                 n = var;
@@ skipping 1377 matching lines @@
         argtype(fn, n->left->type);
         argtype(fn, n->left->type);
         r = mkcall1(fn, n->type, init, typename(n->left->type), l, r);
         if(n->op == ONE) {
                 r = nod(ONOT, r, N);
                 typecheck(&r, Erv);
         }
         *np = r;
         return;
 }