btm_ble_sec: Reset btm pairing state when returning early from handling SMP_COMPLT_EVT

When SMP pairing fails and the device record is not allocated, handling
SMP_COMPLT_EVT will return early without resetting the BTM pairing
state to IDLE. Subsequent pairing attempts triggered immediately after
the previous failure will fail.

Bug: 331682621
Bug: 364321751

Test: m com.android.btservices
Test: Manual
1. Power off BLE device after it is displayed in scanning list
2. Trigger pairing to the BLE device from local device.
3. After pairing fail, trigger another paring immediately

Change-Id: Ie4d3294a321a436727b70eb6ee2823f79ea585fe