sysfs: move sysfs_drop_dentry() to dir.c and make it static
After add/remove path restructuring, the only user of sysfs_drop_dentry() is sysfs_addrm_finish(). Move sysfs_drop_dentry() to dir.c and make it static. Signed-off-by: NTejun Heo <htejun@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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