USB: serial: remove duplicate returns

This small untidiness with two returns in a row was copy and pasted
into mos7720.c and mos7840.c.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/usb/serial/mos7720.c

@@ -2006,7 +2006,6 @@ static int mos7720_ioctl(struct tty_struct *tty,
 		dbg("%s (%d) TIOCSERGETLSR", __func__,  port->number);
 		return get_lsr_info(tty, mos7720_port,
 					(unsigned int __user *)arg);
-		return 0;
 
 	/* FIXME: These should be using the mode methods */
 	case TIOCMBIS:

drivers/usb/serial/mos7840.c

@@ -2263,7 +2263,6 @@ static int mos7840_ioctl(struct tty_struct *tty,
 	case TIOCSERGETLSR:
 		dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
 		return mos7840_get_lsr_info(tty, argp);
-		return 0;
 
 	case TIOCGSERIAL:
 		dbg("%s (%d) TIOCGSERIAL", __func__, port->number);