Correct to i2c_device

Author: tannewt

adafruit_ds3231.py

@@ -101,7 +101,7 @@ def __init__(self, i2c):
         buf = bytearray(2)
         buf[0] = 0x0e
         with self.i2c_device as i2c_device:
-            i2c.write_then_readinto(buf, buf, out_end=1, in_start=1)
+            i2c_device.write_then_readinto(buf, buf, out_end=1, in_start=1)
 
         if (buf[1] & 0b00011000) != 0b00011000:
             raise ValueError("Unable to find DS3231 at i2c address 0x68.")