tty: serial: samsung_tty: remove set but not used variables

The value of 'ret' is not used which reported by svace, so just return
instead of break.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Link: https://lore.kernel.org/r/1619484575-26098-1-git-send-email-tiantao6@hisilicon.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>