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cc1: Improve prtree()

Prtree() is usually used as a debug mechanism. For this reason is
better if it can return the same parameter that it receives, because
using it in this way means that it can be used as a replacement of
functions that return a node pointer.

--- a/src/cmd/cc/cc1/cc1.h

+++ b/src/cmd/cc/cc1/cc1.h

@@ -458,7 +458,7 @@

 #define accept(t) ((yytoken == (t)) ? next() : 0)

 /* code.c */

-extern void prtree(char *s, Node *np);

+extern Node *prtree(char *s, Node *np);

 extern void emit(int, void *);

 extern Node *node(int op, Type *tp, Node *left, Node *rigth);

 extern Node *varnode(Symbol *sym);

--- a/src/cmd/cc/cc1/code.c

+++ b/src/cmd/cc/cc1/code.c

@@ -164,14 +164,18 @@

 		(*opcode[np->op])(np->op, np);

 }

-void

+Node *

 prtree(char *s, Node *np)

 {

+	FILE *tmp = outfp;

+

 	outfp = stderr;

 	fprintf(outfp, "DBG prtree %s", s);

 	emitnode(np);

 	putc('\n', outfp);

-	outfp = stdout;

+	outfp = tmp;

+

+	return np;

 }

 void