module_FindConfig() is not a malloc-style function (fixes #4524)

This partially reverts commit add821b0.

include/vlc_configuration.h

@@ -203,7 +203,7 @@ VLC_EXPORT( int,    config_SaveConfigFile, ( vlc_object_t *, const char * ) );
 VLC_EXPORT( void,   config_ResetAll, ( vlc_object_t * ) );
 #define config_ResetAll(a) config_ResetAll(VLC_OBJECT(a))
 
-VLC_EXPORT( module_config_t *, config_FindConfig,( vlc_object_t *, const char * ) LIBVLC_USED LIBVLC_MALLOC );
+VLC_EXPORT( module_config_t *, config_FindConfig,( vlc_object_t *, const char * ) LIBVLC_USED );
 VLC_EXPORT(char *, config_GetDataDir, ( vlc_object_t * ) LIBVLC_USED LIBVLC_MALLOC );
 #define config_GetDataDir(a) config_GetDataDir(VLC_OBJECT(a))
 VLC_EXPORT(const char *, config_GetLibDir, ( void ) LIBVLC_USED);