Client: add method GetPartition(), make partition private

src/client/Client.hxx

@@ -50,9 +50,9 @@ class Storage;
 class Client final
 	: FullyBufferedSocket, TimeoutMonitor,
 	  public boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::normal_link>> {
-public:
 	Partition &partition;
 
+public:
 	unsigned permission;
 
 	/** the uid of the client process, or -1 if unknown */
@@ -188,6 +188,10 @@ public:
 	 */
 	void AllowFile(Path path_fs) const;
 
+	Partition &GetPartition() {
+		return partition;
+	}
+
 	gcc_pure
 	Instance &GetInstance();