(parse_c_expression): Don't check for null lexptr or *lexptr == 0.

(parse_c_expression): Don't check for null lexptr or *lexptr == 0.  If
yyparse returns nonzero value, abort.

From-SVN: r13655

gcc/cexp.y

@@ -1043,20 +1043,15 @@ parse_c_expression (string)
 {
   lexptr = string;
 
-  if (lexptr == 0 || *lexptr == 0) {
-    error ("empty #if expression");
-    return 0;			/* don't include the #if group */
-  }
-
   /* if there is some sort of scanning error, just return 0 and assume
      the parsing routine has printed an error message somewhere.
      there is surely a better thing to do than this.     */
   if (setjmp (parse_return_error))
     return 0;
 
-  if (yyparse ())
-    return 0;			/* actually this is never reached
-				   the way things stand. */
+  if (yyparse () != 0)
+    abort ();
+
   if (*lexptr != '\n')
     error ("Junk after end of expression.");