drivers: serial: Fix litex driver

[VynDragon]

This fixes several ways to hang the driver in many situations, such as a shell, such as:

• typing too fast
• going over the read buffer capacity
• pasting anything
  etc

[VynDragon]

Is CI dense today? Not only did it get stuck, but now it also reports inexistant issues?

[maass-hamburg]

Please notice you have to use ur legal name for sign off and as author name.

[VynDragon]

Please notice you have to use ur legal name for sign off and as author name.

not only is it present, but it failed on it alone too.

[VynDragon]

rebased on latest main to see if that changes anything.

[maass-hamburg]

If you look at the patch view https://patch-diff.githubusercontent.com/raw/zephyrproject-rtos/zephyr/pull/89379.patch

you can see, that the author's name does not match the signed off entry

From 0c8c159c15a2bd4aa60c7a6c1e2acaf479427a2b Mon Sep 17 00:00:00 2001
From: Vdragon <[email protected]>
Date: Thu, 1 May 2025 21:59:00 +0200
Subject: [PATCH] drivers: serial: Fix litex driver

This fixes several ways to hang the driver, such as:
- typing too fast
- going over the read buffer capacity
- pasting anything
- using arrow keys (sending 2 chars at once)
etc

Signed-off-by: Camille BAUD <[email protected]>
---

[VynDragon]

Thanks, but why is it reporting failing on the email instead of the name?