Fix test to load a hex with flushes
Fix test to load a hex with flushes

The test to flush in the middle of loading a hex file was not actually
flushing anything.  This adds flushing to that test.

google/DAPLink-port,google/DAPLink-port,sg-/DAPLink,sg-/DAPLink,google/DAPLink-port,sg-/DAPLink,google/DAPLink-port