rtc: dev: remove rtc->name from debug message

rtc->name is superfluous here because the rtc is already registered at that
point and its name has already been printed.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index e81a871..794bc4f 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -464,7 +464,7 @@
 		return;
 
 	if (rtc->id >= RTC_DEV_MAX) {
-		dev_dbg(&rtc->dev, "%s: too many RTC devices\n", rtc->name);
+		dev_dbg(&rtc->dev, "too many RTC devices\n");
 		return;
 	}