rtc-ds1307: typo fix found by coverity

Fix a typo turned up by a Coverity check: referring to the wrong register,
which could cause problems with DS1338 RTCs whose oscillators halted.

Signed-off-by: David Brownell <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rtc/rtc-ds1307.c

···
 		/* oscillator fault?  clear flag, and warn */
 		if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
 			i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL,
-					ds1307->regs[DS1337_REG_CONTROL]
+					ds1307->regs[DS1307_REG_CONTROL]
 					& ~DS1338_BIT_OSF);
 			dev_warn(&client->dev, "SET TIME!\n");
 			goto read_rtc;