gbsim/loopback_test: do an fflush() on stdout to ensure timely feedback
gbsim/loopback_test: do an fflush() on stdout to ensure timely feedback

The print routine that gives feedback to the user needs to have an fflush()
to ensure the printout actually appears in time for the user to see it.

Signed-off-by: Bryan O'Donoghue <165dc05575478af93ac2f97f67be6e1756010094@linaro.org>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@google.com>

gregkh/gbsim,projectara/gbsim,projectara/gbsim,gregkh/gbsim