using _exit in fork() (Kamo Hiroyasu)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1669 c046a42c-6fe2-441c-8c8c-71466251a162

vl.c

@@ -2099,7 +2099,7 @@ static int net_tap_init(VLANState *vlan, const char *ifname1,
                 *parg++ = ifname;
                 *parg++ = NULL;
                 execv(setup_script, args);
-                exit(1);
+                _exit(1);
             }
             while (waitpid(pid, &status, 0) != pid);
             if (!WIFEXITED(status) ||