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The sendmsg() syscall is limited in the number of fds it can handle.
This number matches that used by the vfio-user library and is
conservative (since we've seen it work with 64 fds.)
Fixes: #3401
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
(cherry picked from commit 7444c3a0c5)
Signed-off-by: Rob Bradford <robert.bradford@intel.com>