Adam D. Moss 9312e0fd1e
Fix error message when zfs module are already unloaded
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
2021-02-20 20:23:10 -08:00
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