greybus: loopback: use U64_MAX for initialization

Use the largest representable value when initializing the "min"
field when resetting loopback statistics.
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/loopback.c

@@ -340,7 +340,7 @@ static int gb_loopback_request_recv(u8 type, struct gb_operation *operation)
 static void gb_loopback_reset_stats(struct gb_loopback *gb)
 {
 	struct gb_loopback_stats reset = {
-		.min = 0xffffffff,
+		.min = U64_MAX,
 	};
 	memcpy(&gb->latency, &reset, sizeof(struct gb_loopback_stats));
 	memcpy(&gb->throughput, &reset, sizeof(struct gb_loopback_stats));