top: In the bye_bye function, replace fputs with the write interface.

When top calls malloc, if a signal is received, it will
call sig_endpgm to process the signal. In the bye_bye function, if the
-b option is enable, the Batch variable is set, the fputs function
will calls malloc at the same time. The malloc function is not reentrant, so
it will cause the program to crash.

Signed-off-by: Shaohua Zhan <shaohua.zhan@windriver.com>

top/top.c

@@ -571,7 +571,9 @@ static void bye_bye (const char *str) {
       fputs(str, stderr);
       exit(EXIT_FAILURE);
    }
-   if (Batch) fputs("\n", stdout);
+   if (Batch) {
+      write(fileno(stdout), "\n", sizeof("\n"));
+   }
    exit(EXIT_SUCCESS);
 } // end: bye_bye