btrfs: remove unnecessary check of iput argument

iput() already handles NULL and non-NULL parameter, so it is not needed
to check that. This unifies all iput calls.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>