CVE-2025-22033 arm64: Don't call NULL in do_compat_alignment_fixup()

In the Linux kernel, the following vulnerability has been resolved: arm64: Don't call NULL in docompatalignmentfixup doalignmentt32tohandler only fixes up alignment faults for specific instructions; it returns NULL otherwise e.g. LDREX. When that's the case, signal to the caller that it needs to...