Max Stepanov

Fixing https://github.com/bakerface/wireless-tools/issues/45

I'm observing build failure on my Rpi4: ``` make[2]: Entering directory '/home/pi/build/adb-source/src' g++ -DHAVE_CONFIG_H -I. -I.. -Wdate-time -D_FORTIFY_SOURCE=2 -I/tmp/openssl/include -I../include -I../lib/base/include -I../lib/libcrypto_utils/include -std=c++14 -lcrypto -lpthread -lrt -DADB_HOST=1 -DHAVE_FORKEXEC=1 -DHAVE_SYMLINKS -DHAVE_TERMIO_H...

Netboot is not retrying when TFTP download is timed out

2

### Describe the bug From time to time we observe situation when rpi5 can't boot via network. After showing boot sequence on HDMI we see black screen and boot sequence...