ClientFile: move client_allow_file() into the Client class

src/client/ClientFile.cxx

@@ -18,7 +18,6 @@
  */
 
 #include "config.h"
-#include "ClientFile.hxx"
 #include "Client.hxx"
 #include "protocol/Ack.hxx"
 #include "fs/Path.hxx"
@@ -29,16 +28,14 @@
 #include <unistd.h>
 
 bool
-client_allow_file(const Client &client, Path path_fs, Error &error)
+Client::AllowFile(Path path_fs, Error &error) const
 {
 #ifdef WIN32
-	(void)client;
 	(void)path_fs;
 
 	error.Set(ack_domain, ACK_ERROR_PERMISSION, "Access denied");
 	return false;
 #else
-	const int uid = client.GetUID();
 	if (uid >= 0 && (uid_t)uid == geteuid())
 		/* always allow access if user runs his own MPD
 		   instance */