db/upnp/Object: disallow copying, always move

Reduce bloat.

src/db/UpnpDatabasePlugin.cxx

@@ -488,7 +488,7 @@ UpnpDatabase::ReadNode(ContentDirectoryService *server,
 		return false;
 
 	if (dirbuf.objects.size() == 1) {
-		dirent = dirbuf.objects[0];
+		dirent = std::move(dirbuf.objects[0]);
 	} else {
 		error.Format(upnp_domain, "Bad resource");
 		return false;
@@ -542,8 +542,7 @@ UpnpDatabase::Namei(ContentDirectoryService* server,
 			return false;
 
 		// Look for the name in the sub-container list
-		const UPnPDirObject *child =
-			dirbuf.FindObject(vpath[i].c_str());
+		UPnPDirObject *child = dirbuf.FindObject(vpath[i].c_str());
 		if (child == nullptr)
 			break;
 
@@ -558,7 +557,7 @@ UpnpDatabase::Namei(ContentDirectoryService* server,
 				// The last element in the path was found and it's
 				// a container, we're done
 				oobjid = objid;
-				odirent = *child;
+				odirent = std::move(*child);
 				return true;
 			}
 			break;
@@ -568,7 +567,7 @@ UpnpDatabase::Namei(ContentDirectoryService* server,
 			// else it does not exist
 			if (i == vpath.size() - 1) {
 				oobjid = objid;
-				odirent = *child;
+				odirent = std::move(*child);
 				return true;
 			} else {
 				error.Format(db_domain, DB_NOT_FOUND,

src/db/upnp/Directory.cxx

@@ -151,7 +151,7 @@ protected:
 	{
 		if ((!strcmp(name, "container") || !strcmp(name, "item")) &&
 		    checkobjok())
-			m_dir.objects.push_back(m_tobj);
+			m_dir.objects.push_back(std::move(m_tobj));
 
 		m_path.pop_back();
 	}

src/db/upnp/Directory.hxx

@@ -37,8 +37,8 @@ public:
 	std::vector<UPnPDirObject> objects;
 
 	gcc_pure
-	const UPnPDirObject *FindObject(const char *name) const {
-		for (const auto &o : objects)
+	UPnPDirObject *FindObject(const char *name) {
+		for (auto &o : objects)
 			if (o.name == name)
 				return &o;
 

src/db/upnp/Object.hxx

@@ -70,6 +70,10 @@ public:
 	 */
 	int duration;
 
+	UPnPDirObject() = default;
+	UPnPDirObject(UPnPDirObject &&) = default;
+	UPnPDirObject &operator=(UPnPDirObject &&) = default;
+
 	/** Get named property
 	 * @param property name (e.g. upnp:artist, upnp:album,
 	 *     upnp:originalTrackNumber, upnp:genre). Use m_title instead