rtc: at91sam9: remove useless check

rtc->sclk necessarily points to a valid clocks at this point. Else the
probe would have aborted.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 152cd81..0a8485a 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -494,8 +494,7 @@
 	/* disable all interrupts */
 	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
 
-	if (!IS_ERR(rtc->sclk))
-		clk_disable_unprepare(rtc->sclk);
+	clk_disable_unprepare(rtc->sclk);
 
 	return 0;
 }