greybus: loopback: Send some sensible data

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odnoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/loopback.c

@@ -273,6 +273,8 @@ static int gb_loopback_transfer(struct gb_loopback *gb, u32 len)
 		return -ENOMEM;
 	}
 
+	memset(request->data, 0x5A, len);
+
 	request->len = cpu_to_le32(len);
 
 	do_gettimeofday(&ts);