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i#5085 vsys hook: Handle hook failure in SA_RESTART adjustment

Merged Derek Bruening requested to merge i5085-vsyscall-change into master

Adds handling of the vsyscall hook failing by avoiding trying to set the PC to the (zero) displacement PC in such a case.

Tested on a 5.11 kernel where 32-bit hello,world under DR crashes without this fix but works with the fix.

Issue #5085 (closed)