tty: tty_port: Fix coding style issues of block comments

Fix coding style issues of block comments, reported by checkpatch.pl.
Besides, add a period at the end of the sentenses.
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Link: https://lore.kernel.org/r/1620811585-18582-18-git-send-email-tanxiaofei@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_port.c

@@ -468,7 +468,8 @@ int tty_port_block_til_ready(struct tty_port *port,
 	DEFINE_WAIT(wait);
 
 	/* if non-blocking mode is set we can pass directly to open unless
-	   the port has just hung up or is in another error state */
+	 * the port has just hung up or is in another error state.
+	 */
 	if (tty_io_error(tty)) {
 		tty_port_set_active(port, 1);
 		return 0;
@@ -485,8 +486,9 @@ int tty_port_block_til_ready(struct tty_port *port,
 		do_clocal = 1;
 
 	/* Block waiting until we can proceed. We may need to wait for the
-	   carrier, but we must also wait for any close that is in progress
-	   before the next open may complete */
+	 * carrier, but we must also wait for any close that is in progress
+	 * before the next open may complete.
+	 */
 
 	retval = 0;
 
@@ -503,7 +505,8 @@ int tty_port_block_til_ready(struct tty_port *port,
 
 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
 		/* Check for a hangup or uninitialised port.
-							Return accordingly */
+		 * Return accordingly.
+		 */
 		if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
 			if (port->flags & ASYNC_HUP_NOTIFY)
 				retval = -EAGAIN;
@@ -530,7 +533,8 @@ int tty_port_block_til_ready(struct tty_port *port,
 	finish_wait(&port->open_wait, &wait);
 
 	/* Update counts. A parallel hangup will have set count to zero and
-	   we must not mess that up further */
+	 * we must not mess that up further.
+	 */
 	spin_lock_irqsave(&port->lock, flags);
 	if (!tty_hung_up_p(filp))
 		port->count++;