bts: Fix a typo in the log message
bts: Fix a typo in the log message

osmocom/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts,osmocom/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts