HID: wacom: fix kobject reference count leak

When sysfs_create_files() fails in wacom_initialize_remotes() the error
is returned and the cleanup action will not have been registered yet.

As a result the kobject???s refcount is never dropped, so the
kobject can never be freed leading to a reference leak.

Fix this by calling kobject_put() before returning.

Fixes: 83e6b40e ("HID: wacom: EKR: have the wacom resources dynamically allocated")
Acked-by: Ping Cheng <ping.cheng@wacom.com>
Cc: stable@vger.kernel.org
Signed-off-by: Qasim Ijaz <qasdev00@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>