gpio: pcf857x: Drop unneeded explicit casting

The s32 is compatible with int, no need to cast.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-pcf857x.c

@@ -88,7 +88,7 @@ static int i2c_write_le8(struct i2c_client *client, unsigned int data)
 
 static int i2c_read_le8(struct i2c_client *client)
 {
-	return (int)i2c_smbus_read_byte(client);
+	return i2c_smbus_read_byte(client);
 }
 
 /* Talk to 16-bit I/O expander */