staging: greybus: loopback_test: fix comment style issues

According to checkpatch warning, block comments should align the * on
each line. Also, preferred style for multi-line comments is starting the
comment text after the second *.
Signed-off-by: Aleksey Rybalkin <aleksey@rybalkin.org>
Acked-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/tools/loopback_test.c

@@ -779,7 +779,8 @@ static void prepare_devices(struct loopback_test *t)
 {
 	int i;
 
-	/* Cancel any running tests on enabled devices. If
+	/*
+	 * Cancel any running tests on enabled devices. If
 	 * stop_all option is given, stop test on all devices.
 	 */
 	for (i = 0; i < t->device_count; i++)