[server] Do not own dmabuf implementation

Summary:
The dmabuf implementation should be managed by the compositor and not by the
interface which might go away through signals while the implementation goes
away in the compositor simultaneously.

Test Plan: Compiles.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D25576

src/wayland/server/linuxdmabuf_v1_interface.cpp

@@ -428,10 +428,7 @@ V1Iface::Private::Private(V1Iface *q, Display *display)
 {
 }
 
-V1Iface::Private::~Private()
-{
-    delete impl;
-}
+V1Iface::Private::~Private() = default;
 
 void V1Iface::Private::bind(wl_client *client, uint32_t version, uint32_t id)
 {

src/wayland/server/linuxdmabuf_v1_interface.h

@@ -146,6 +146,8 @@ public:
 
     /**
      * Sets the compositor implementation for the dmabuf interface.
+     *
+     * The ownership is not transferred by this call.
      */
     void setImpl(Impl *impl);