staging: pi433: remove comparison with true

Fixes checkpatch warning for error prone comparison.

Signed-off-by: Valentin Vidic <Valentin.Vidic@CARNet.hr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/pi433/pi433_if.c

@@ -638,7 +638,7 @@ pi433_tx_thread(void *data)
 		 */
 		wait_event_interruptible(device->tx_wait_queue,
 					 !device->rx_active ||
-					  device->interrupt_rx_allowed == true);
+					  device->interrupt_rx_allowed);
 
 		/* prevent race conditions
 		 * irq will be reenabled after tx config is set