kdbus: Remove the unnecessary code that unlink the reply twice.

kdbus: Remove the unnecessary code that unlink the reply twice.

In sync call situation, kdbus_conn_reply() calls kdbus_reply_unlink(reply).
Then, kdbus_conn_entry_sync_attach() also calls kdbus_reply_unlink(reply_wake),
so it is called twice. Even it has no problems because kdbus_reply_unlink()
does't free twice, but it is unnecessary.

Signed-off-by: INSUN PYO <insun.pyo@samsung.com>
Change-Id: Ia2b3552ee2e6a49ff97bb9d8f6e62964fe6d2cbf
(cherry picked from commit 81c82865a0f660cf3d552ca5879f674222e7060a)