rtc: wm8350: Remove unused to_wm8350_from_rtc_dev

The to_wm8350_from_rtc_dev macro is not used by anything in the
rtc-wm8350 driver.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-wm8350.c

@@ -30,8 +30,6 @@
 #define WM8350_SET_TIME_RETRIES	5
 #define WM8350_GET_TIME_RETRIES	5
 
-#define to_wm8350_from_rtc_dev(d) container_of(d, struct wm8350, rtc.pdev.dev)
-
 /*
  * Read current time and date in RTC
  */