i2c: gpio: Drop dead code in i2c_gpio_remove

Commit a0682a31 ("i2c: gpio: Use devm_gpio_request()") left unused
code behind, clean it up.

Fixes: a0682a31 ("i2c: gpio: Use devm_gpio_request()")
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>