Ignore LCB entries that migth have been released while queued

Function btm_send_pending_direct_conn() dequeues tL2C_LCB
entries from the conn_pending_q queue and calls the processing
function.
However, there is the possilility of a race condition
and releasing the entry by l2cu_release_lcb() before it is processed.
Now tL2C_LCB that are not in_use are ignored.

Bug: 27418154
Change-Id: I4b5fda605a60c8aebbf5587bb12dd74ac5d28f68
1 file changed