f2fs: fix to check sysfs filename w/ gc_pin_file_thresh correctly
Sysfs entry name is gc_pin_file_thresh instead of gc_pin_file_threshold,
fix it.
Cc: stable@kernel.org
Fixes: c521a6ab4ad7 ("f2fs: fix to limit gc_pin_file_threshold")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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