btrfs: sysfs: use sysfs_streq for string matching
We have own string matching helper that duplicates what sysfs_streq does, with a slight difference that it skips initial whitespace. So far this is used for the drive allocation policy. The initial whitespace of written sysfs values should be rather discouraged and we should use a standard helper. Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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