Improve my fix to 1988/phillipps

The return in main() to pain() can be negated just like main() did to
itself (and now pain() does). Now the program exits with 0.

1988/phillipps/phillipps.c

@@ -58,6 +58,6 @@ _,
 **
 a;
 {
-				return
+				return!
 pain(t,(int)_,
 (char *)a);}