rtc: Remove unused rtc_dev_exit().

Commit 270a3bd6 ("rtc: make class.c explicitly non-modular")
removed rtc_dev_exit() call.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1e2f9a99-435d-e149-7456-dfacd53be85a@I-love.SAKURA.ne.jp

drivers/rtc/dev.c

@@ -566,9 +566,3 @@ void __init rtc_dev_init(void)
 	if (err < 0)
 		pr_err("failed to allocate char dev region\n");
 }
-
-void __exit rtc_dev_exit(void)
-{
-	if (rtc_devt)
-		unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
-}

drivers/rtc/rtc-core.h

@@ -2,7 +2,6 @@
 #ifdef CONFIG_RTC_INTF_DEV
 
 extern void __init rtc_dev_init(void);
-extern void __exit rtc_dev_exit(void);
 extern void rtc_dev_prepare(struct rtc_device *rtc);
 
 #else
@@ -11,10 +10,6 @@ static inline void rtc_dev_init(void)
 {
 }
 
-static inline void rtc_dev_exit(void)
-{
-}
-
 static inline void rtc_dev_prepare(struct rtc_device *rtc)
 {
 }