Merge commit d8a09b3a0 from openzfs git (by Ryan Libby):

  lua: avoid gcc -Wreturn-local-addr bug

  Avoid a bug with gcc's -Wreturn-local-addr warning with some
  obfuscation.  In buggy versions of gcc, if a return value is an
  expression that involves the address of a local variable, and even if
  that address is legally converted to a non-pointer type, a warning may
  be emitted and the value of the address may be replaced with zero.
  Howerver, buggy versions don't emit the warning or replace the value
  when simply returning a local variable of non-pointer type.

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90737

  Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
  Signed-off-by: Ryan Libby <rlibby@FreeBSD.org>
  Closes #11337

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