rtc: fix kconfig help

Signed-off-by: NAlessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/Kconfig

@@ -16,7 +16,7 @@ menuconfig RTC_CLASS
 	  probably want to enable one or more of the interfaces below.
 
 	  This driver can also be built as a module. If so, the module
-	  will be called rtc-class.
+	  will be called rtc-core.
 
 if RTC_CLASS