[Coverity CID :190991]Error handling issues in /subsys/bluetooth/controller/ll_sw/ull_conn.c

[mandarcthorat1]

Static code scan issues seen in File: /subsys/bluetooth/controller/ll_sw/ull_conn.c
Category: Error handling issues
Function: ticker_op_stop_cb
Component: Bluetooth
CID: 190991
Please fix or provide comments to square it off in coverity in the link: https://scan9.coverity.com/reports.htm#v32951/p12996