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rc.io is called from 2 places in rc.interface:
- if [ $OUTPUT_MODE = io -o $OUTPUT_MODE = uavcan_esc ]:
- 'set OUTPUT_MODE io' is only set within USE_IO=yes, so removing
the check in rc.io has no effect.
- in case of UAVCAN, we also want the IO for RC, now covered in the next
case.
- Further down ('Start IO for RC input if needed.').
This is intended to start IO for RC only, when fmu is already started.
However the previous check '$USE_IO = yes' in rc.io prevented that.
In addition we don't start rc_input in case of $USE_IO = no.
Fixes no RC on Pixhawk 2 with SYS_USE_IO=0.