rtc: ds1307: fix compile warning if RTC_DRV_DS1307_CENTURY isn't defined

rtc: ds1307: fix compile warning if RTC_DRV_DS1307_CENTURY isn't defined

[Heiner Kallweit]

Fix the following warning if RTC_DRV_DS1307_CENTURY isn't defined.

drivers/rtc/rtc-ds1307.c: In function 'ds1307_get_time':
drivers/rtc/rtc-ds1307.c:342:26: warning: unused variable 'chip' [-Wunused-variable]
  const struct chip_desc *chip = &chips[ds1307->type];
                          ^
Fixes: 436c93db60a4 ("rtc: ds1307: factor out century bit handling")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/rtc/rtc-ds1307.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 43e9dc6f..18b6a6af 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -368,10 +368,9 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 	t->tm_mon = bcd2bin(tmp) - 1;
 	t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
 
-#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
-	if (ds1307->regs[chip->century_reg] & chip->century_bit)
+	if (ds1307->regs[chip->century_reg] & chip->century_bit &&
+	    IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
 		t->tm_year += 100;
-#endif
 
 	dev_dbg(dev, "%s secs=%d, mins=%d, "
 		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
-- 
2.13.1