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;