[PATCH v2 15/22] usb: serial: ti_usb_3410_5052: Check old_termios parameter in set_termios

The old_termios parameter is never used in set_termios callback. Add a check to old_termios to see if we can return right away because there is nothing to change. Also pass NULL for old_termios in open callback because it is the initial call to set_termios. Signed-off-by: Mathieu OTHACEHE

[PATCH v2 15/22] usb: serial: ti_usb_3410_5052: Check old_termios parameter in set_termios

The old_termios parameter is never used in set_termios callback. Add a check to old_termios to see if we can return right away because there is nothing to change. Also pass NULL for old_termios in open callback because it is the initial call to set_termios. Signed-off-by: Mathieu OTHACEHE ---