9312e0fd1e
Using zfs-sh -u on linux will fail with inaccurate message when the zfs modules are already unloaded. Deal with the case where a module is already unloaded; its USE_COUNT will be the empty string Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Adam Moss <c@yotes.com> Closes #11627