BACKPORT: tty: serial: qcom-geni-serial: drop the return value from handle_rx

The return value of the handle_rx() callback is never checked. Drop it.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-12-brgl@bgdev.pl


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

Bug: 370629635
Change-Id: I41a50a0d933243fa03502c5fda997bd53ae14080
(cherry picked from commit 0626afe5)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>