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Avoid segfault in expand()

The debug fprintf in expect() was using macroname, which was
not defined in the case of symfile and symline.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -194,6 +194,7 @@

 	char *s = sym->u.s;

 	char *arglist[NR_MACROARG], arguments[INPUTSIZ], buffer[BUFSIZE];

+	macroname = sym->name;

 	if (sym == symfile) {

 		elen = sprintf(buffer, "\"%s\"", input->fname);

 		goto substitute;

@@ -203,7 +204,6 @@

 		goto substitute;

 	}

-	macroname = sym->name;

 	if (!parsepars(arguments, arglist, atoi(s)))

 		return 0;

 	for (n = 0; n < atoi(s); ++n)