arm64: Add regs_return_value() in syscall.h
arm64: Add regs_return_value() in syscall.h

This macro, regs_return_value, is used mainly for audit to record system
call's results, but may also be used in test_kprobes.c.

Acked-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>
Acked-by: Richard Guy Briggs <eb4b5bbb4a6cbf3468229148f167a307303eeb1f@redhat.com>
Signed-off-by: AKASHI Takahiro <be00867a1b2ca7b25ce4b2b4a9efd7cdbb9c164b@linaro.org>
Signed-off-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>
Signed-off-by: Catalin Marinas <15ce75b290ebaf27c3f9fd73ab848685ed3d8261@arm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs