vhost: fix typo in comment

Fixes: 3670686ab99f ("vhost: fix race for connection fd")
Cc: stable@dpdk.org

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>

lib/librte_vhost/fd_man.c

@@ -293,7 +293,7 @@ fdset_event_dispatch(void *arg)
 			 * because the fd is closed in the cb,
 			 * the old fd val could be reused by when creates new
 			 * listen fd in another thread, we couldn't call
-			 * fd_set_del.
+			 * fdset_del.
 			 */
 			if (remove1 || remove2) {
 				pfdentry->fd = -1;