locking/atomic/x86: Correct the definition of __arch_try_cmpxchg128()

Correct the definition of __arch_try_cmpxchg128(), introduced by:

  b23e139d ("arch: Introduce arch_{,try_}_cmpxchg128{,_local}()")

Fixes: b23e139d

 ("arch: Introduce arch_{,try_}_cmpxchg128{,_local}()")
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20240408091547.90111-2-ubizjak@gmail.com