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Check correctness of endf functions in cc2

These commit enforces the check that when the file finishs
then the code is not inside some function.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -363,6 +363,8 @@

 static void

 endfunction(char *token)

 {

+	if (!curfun)

+		error(ESYNTAX);

 	listp = NULL;

 	genstack(curfun);

 	genaddable(listexp);

@@ -487,7 +489,8 @@

 found_eof:

 	if (ferror(stdin))

 		error(EFERROR, strerror(errno));

-	return;

+	if (!curfun)

+		return;

 syntax_error:

 	error(ESYNTAX);