btrfs: fix double free in create_space_info() error path

When kobject_init_and_add() fails, the call chain is:

create_space_info()
-> btrfs_sysfs_add_space_info_type()
-> kobject_init_and_add()
-> failure
-> kobject_put(&space_info->kobj)
-> space_info_release()
-> kfree(space_info)

Then control returns to create_space_info():

btrfs_sysfs_add_space_info_type() returns error
-> goto out_free
-> kfree(space_info)

This causes a double free.

Keep the direct kfree(space_info) for the earlier failure path, but
after btrfs_sysfs_add_space_info_type() has called kobject_put(), let
the kobject release callback handle the cleanup.

Fixes: a11224a016d6d ("btrfs: fix memory leaks in create_space_info() error paths")
CC: stable@vger.kernel.org # 6.19+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>