rtc: s3c: remove unnecessary NULL assignment

It's unnecessary the code that assigns info->rtc_clk to NULL in
s3c_rtc_remove.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 3ee9615..7cc8f73 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -425,7 +425,6 @@
 	if (info->data->needs_src_clk)
 		clk_unprepare(info->rtc_src_clk);
 	clk_unprepare(info->rtc_clk);
-	info->rtc_clk = NULL;
 
 	return 0;
 }