why do we delete target in RGWGetObjLayout constructed function?

[liuchang0812 <liuchang0812@xxxxxxxxx>]

I saw this problem when i read RGW source code. It seems that that
`delete` a nullptr will segment fault.

code[1]:

class RGWGetObjLayout : public RGWOp {
   protected:
        RGWRados::Object *target{nullptr};
        RGWObjManifest *manifest{nullptr};
        rgw_raw_obj head_obj;
    public:
         RGWGetObjLayout() {
             delete target;
   }


[1]. https://github.com/ceph/ceph/blob/master/src/rgw/rgw_op.h#L1777
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