bsc: timelost_fsm: Remove unneeded set of out variable on failure

Documentation of the function explicitly states that the out
target_pchan param returns the "PCHAN waited for". If we return false,
then no PCHAN is being waited for. The 2 callers of this function only
use this out param if function returns true, so let's simplify the code.

Change-Id: Ib8f9b7e1f584dee885d6823dc043682577572bd8
1 file changed