[PAL,LibOS,common] Convert PAL errors to negative values

[oshogbo]

Description of the changes

Change PAL error to negative values. This will simplify the process of changing the function to return pal_error_t instead of int.

How to test this PR?

CI/CD

---

This change is 

[mkow]

common/src/pal_error.c line 8 at r2 (raw file):

Previously, dimakuv (Dmitrii Kuvaiskii) wrote…

Also @mwkmwkmwk

Sure, sounds like a good idea.