fix wrong offset addr in _write_socket()

Author: bjnhur

adafruit_wiznet5k/adafruit_wiznet5k.py

@@ -864,9 +864,8 @@ def _read_snmr(self, sock):
 
     def _write_socket(self, sock, address, data):
         """Write to a W5k socket register."""
-        base = self._ch_base_msb << 8
         cntl_byte = (sock << 5) + 0x0C
-        return self.write(base + sock * CH_SIZE + address, cntl_byte, data)
+        return self.write(address, cntl_byte, data)
 
     def _read_socket(self, sock, address):
         """Read a W5k socket register."""