sysfs: Use local reference in compat_only_sysfs_link_entry_to_kobj()

As we have just obtained target_kobj->sd into a local variable, and
incremented the object's reference count, it is better to use the local
variable instead of the original reference.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20210714151559.2532572-1-geert@linux-m68k.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>