Store task_id of the current thread for the ISR before waiting for the transient event

The ISR will send a transient event to the task specified in bus->taskid.
Make sure that the correct task_id is written to this field before waiting
for the transient event to arrive.

Fixes #2483

c/src/lib/libbsp/arm/raspberrypi/i2c/i2c.c

@@ -92,6 +92,7 @@ static int rpi_i2c_bus_transfer(rpi_i2c_bus *bus)
 
       /* Sleep until the TX FIFO has free space for a new write. */
       if (
+          bus->task_id = rtems_task_self();
           rtems_event_transient_receive(RTEMS_WAIT, bus->base.timeout) !=
           RTEMS_SUCCESSFUL
       ) {