drivers/rtc/rtc-stmp3xxx.c: check the return value from stmp_reset_block()

stmp_reset_block() may fail, so let's check its return value and
propagate it in the case of error.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-stmp3xxx.c

@@ -261,7 +261,12 @@ static int stmp3xxx_rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, rtc_data);
 
-	stmp_reset_block(rtc_data->io);
+	err = stmp_reset_block(rtc_data->io);
+	if (err) {
+		dev_err(&pdev->dev, "stmp_reset_block failed: %d\n", err);
+		return err;
+	}
+
 	writel(STMP3XXX_RTC_PERSISTENT0_ALARM_EN |
 			STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN |
 			STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE,