[PATCH] rtc: ds1390: mark OF related data as maybe unused

[Krzysztof Kozlowski]

The driver can be compile tested with !CONFIG_OF making certain data
unused:

  drivers/rtc/rtc-ds1390.c:216:34: error: ‘ds1390_of_match’ defined but not used [-Werror=unused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
 drivers/rtc/rtc-ds1390.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-ds1390.c b/drivers/rtc/rtc-ds1390.c
index 93ce72b9ae59..f46428ca77cc 100644
--- a/drivers/rtc/rtc-ds1390.c
+++ b/drivers/rtc/rtc-ds1390.c
@@ -213,7 +213,7 @@ static int ds1390_probe(struct spi_device *spi)
 	return res;
 }
 
-static const struct of_device_id ds1390_of_match[] = {
+static const struct of_device_id ds1390_of_match[] __maybe_unused = {
 	{ .compatible = "dallas,ds1390" },
 	{}
 };
-- 
2.34.1