Created attachment 8387 
Fix compiler warnings

On FreeBSD (amd64) default compiler is clang, I get some warnings (bad cast, and duplicate declaration).

For src/misc/parole-file.h I have a lot of warnings like this:

>In file included from ../../src/parole-medialist.h:28:
>../../src/misc/parole-file.h:78:1: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
>G_CONST_RETURN *parole_file_get_directory           (const ParoleFile *file) G_GNUC_PURE;
>                                                                                                                              ^
>/usr/local/include/glib-2.0/glib/gmacros.h:363:24: note: expanded from macro 'G_CONST_RETURN'
>#define G_CONST_RETURN const
>                                            ^

In src/gst/parole-gst.c, I have

>parole-gst.c:1504:41: warning: implicit conversion from enumeration type 'GstStateChangeReturn' to different enumeration type 'GstState' [-Wenum-conversion]
>                                        GST_STATE_RETURN(gst->priv->playbin),
>                                        ^~~~~~~~~~~~~~~~~~~~~~~~
>/usr/local/include/gstreamer-1.0/gst/gstelement.h:141:66: note: expanded from macro 'GST_STATE_RETURN'
>#define GST_STATE_RETURN(elem)          (GST_ELEMENT_CAST(elem)->last_return)
>                                                                    ~~~~~~~~~~~~~~~~~^~~~~~~

The documentation says GST_STATE_RETURN returns the last GstStateChangeReturn value. It is not GstState. In GstElement struct only ones GstState members are:
- target_state
- current_state
- next_state

I think new "state" be target_state member of GstElement.