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Fix bug in listdcl

A declarator generates a derivated type from a base type. So the value
returned by decl_type is a new type. If we don't save the base type
the next variables in the declaration list will have the declarator
type and not the base type.

--- a/decl.c

+++ b/decl.c

@@ -157,15 +157,16 @@

 }

 static struct node *

-listdcl(struct ctype *tp)

+listdcl(struct ctype *base)

 {

 	struct node *lp = nodecomp();

 	do {

-		register struct node *sp, *np;

+		struct node *sp, *np;

+		register struct ctype *tp;

 		declarator();

-		tp = decl_type(tp);

+		tp = decl_type(base);

 		if (!tp->type) {

 			warning_error(options.implicit,

 				      "type defaults to 'int' in declaration of '%s'",

-- 

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