debugfs: rename end_creating() to debugfs_end_creating()

debugfs: rename end_creating() to debugfs_end_creating()

By not using the generic end_creating() name here we are free to use it
more globally for a more generic function.
This should have been done when start_creating() was renamed.

For consistency, also rename failed_creating().

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://patch.msgid.link/20251113002050.676694-2-neilb@ownmail.net
Tested-by: syzbot@syzkaller.appspotmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>