fix crash with unset arrays in arithmetic constructs ; change to avoid printing foreground job statuses when we don't want to

lib/readline/input.c

@@ -818,7 +818,7 @@ rl_getc (FILE *stream)
       /* We know at this point that _rl_caught_signal == 0 */
 
 #if defined (__MINGW32__)
-      if (isatty (fd)
+      if (isatty (fd))
 	return (_getch ());	/* "There is no error return." */
 #endif
       result = 0;