Merge commit 956f94010 from openzfs git (by Ryan Libby):

  spa: avoid type narrowing warning

  Building the spa module for i386 caused gcc to emit
  -Wint-to-pointer-cast "cast to pointer from integer of different size"
  because spa.spa_did was uint64_t but pthread_join (via thread_join in
  spa_deactivate) takes a pointer (32-bit on i386).  Define spa_did to be
  pointer-size instead.  For now spa_did is in fact never non-zero and the
  thread_join could instead be ifdef'd out, but changing the size of
  spa_did may be more useful for the future.

  Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
  Signed-off-by: Ryan Libby <rlibby@FreeBSD.org>
  Closes #11336

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