fix failure detection in streaming example

Author: 2bndy5

examples/nrf24l01_stream_test.py

@@ -112,7 +112,7 @@ def master_fifo(count=1, size=32):
         for buf in payloads:
             while not nrf.write(buf) and failures <= 99:
                 # NOTE write() returns False if TX FIFO is already full
-                if nrf.irq_df:  # reception failed; TX FIFO is locked
+                if nrf.update() and nrf.irq_df:  # reception failed; TX FIFO is locked
                     failures += 1  # increment manual retries
                     # we need to reset the irq_rf flag and the radio's CE pin
                     nrf.ce_pin = False  # fall back to Standby-I mode