rtc: rs5c372: quiet maybe-unused variable warning

When CONFIG_OF is disabled then the matching table is not referenced.

Signed-off-by: Alexandre Belloni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/rtc/rtc-rs5c372.c

···
 };
 MODULE_DEVICE_TABLE(i2c, rs5c372_id);
 
-static const struct of_device_id rs5c372_of_match[] = {
+static const __maybe_unused struct of_device_id rs5c372_of_match[] = {
 	{
 		.compatible = "ricoh,r2025sd",
 		.data = (void *)rtc_r2025sd