staging: pi433: Add debugfs_remove in case of driver register fails.

debugfs resources were never cleaned in case of failure to register driver.

Reported-by Dan Carpenter <dan.carpenter@linaro.org>

Fixes: 4ef027d5 ("staging: pi433: add debugfs interface")
Signed-off-by: Shahar Avidar <ikobh7@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20240405074000.3481217-7-ikobh7@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>