mali_kbase: MIDCET-4220 Patch for GPUSWERRATA-1436

    This patch is a fix for:
      - SW Errata: 2716399
      - CVE: None
    This patch fixes bad pointer access in
    shrinker callback.

Bug: 251397485
Provenance: https://code.ipdelivery.arm.com/c/GPU/mali-ddk/+/4612
Signed-off-by: Jack Diver <diverj@google.com>
Change-Id: I49f11ef55a8fb1c7f8af9a56b3391ee10feb5cbd