Transceiver: pullRadioVector(): Move initialization of var to start of function
Transceiver: pullRadioVector(): Move initialization of var to start of function

This will be needed upon forthcoming refactor to support idle frames,
which will add a goto return. Otherwise compiler complains:

error: jump to label ret_idle [-fpermissive]
note:   crosses initialization of unsigned int max_toa

Change-Id: Icd2793adc7b73a795184639b95fb5da336909b59

osmocom/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx