staging: lustre: use strim instead of cfs_trimwhite.
Linux lib provides identical functionality to cfs_trimwhite, so discard that code and use the standard. Signed-off-by: NNeilBrown <neilb@suse.com> Reviewed-by: NAndreas Dilger <andreas.dilger@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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