Revert "rtc: m41t80: Clear oscillator fault bit during probe"

This reverts commit 206778f.

When the OF bit is set, we want to ignore the stored value
until it's overwritten by a new one because it's known to be
invalid. The OF bit is being cleared in m41t80_rtc_set_time
already, so once the kernel stores a valid value into RTC
it can get read on next boot without issues.

Closes torvalds#258

drivers/rtc/rtc-m41t80.c

@@ -959,17 +959,6 @@ static int m41t80_probe(struct i2c_client *client,
 		return rc;
 	}
 
-	/* Make sure OF (osciallator failure) is  cleared */
-	rc = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
-
-	if (rc >= 0)
-		rc = i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
-					       rc & ~M41T80_FLAGS_OF);
-	if (rc < 0) {
-		dev_err(&client->dev, "Can't clear OF bit\n");
-		return rc;
-	}
-
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 	if (m41t80_data->features & M41T80_FEATURE_HT) {
 		save_client = client;