Used wrong variable name for IOCON

Author: c0redumb

src/Adafruit_MCP23XXX.cpp

@@ -150,11 +150,11 @@ void Adafruit_MCP23XXX::writeGPIO(uint8_t value, uint8_t port) {
 /**************************************************************************/
 void Adafruit_MCP23XXX::setupInterrupts(bool mirroring, bool openDrain,
                                         uint8_t polarity) {
-  Adafruit_BusIO_Register GPINTEN(i2c_dev, spi_dev, MCP23XXX_SPIREG,
+  Adafruit_BusIO_Register IOCON(i2c_dev, spi_dev, MCP23XXX_SPIREG,
                                   getRegister(MCP23XXX_IOCON));
-  Adafruit_BusIO_RegisterBits mirror_bit(&GPINTEN, 1, 6);
-  Adafruit_BusIO_RegisterBits openDrain_bit(&GPINTEN, 1, 2);
-  Adafruit_BusIO_RegisterBits polarity_bit(&GPINTEN, 1, 1);
+  Adafruit_BusIO_RegisterBits mirror_bit(&IOCON, 1, 6);
+  Adafruit_BusIO_RegisterBits openDrain_bit(&IOCON, 1, 2);
+  Adafruit_BusIO_RegisterBits polarity_bit(&IOCON, 1, 1);
 
   mirror_bit.write(mirroring ? 1 : 0);
   openDrain_bit.write(openDrain ? 1 : 0);