lib: retain/release the instance more consistently

All objects with a pointer back to the instance ought to retain a
reference to it (which currently means pretty much all objects).

lib/media.c

@@ -375,6 +375,7 @@ libvlc_media_t * libvlc_media_new_from_input_item(
 
     install_input_item_observer( p_md );
 
+    libvlc_retain( p_instance );
     return p_md;
 }
 
@@ -532,7 +533,7 @@ void libvlc_media_release( libvlc_media_t *p_md )
     libvlc_event_send( p_md->p_event_manager, &event );
 
     libvlc_event_manager_release( p_md->p_event_manager );
-
+    libvlc_release( p_md->p_libvlc_instance );
     free( p_md );
 }
 

lib/media_discoverer.c

@@ -254,6 +254,7 @@ libvlc_media_discoverer_new( libvlc_instance_t * p_inst, const char * psz_name )
                       services_discovery_removeall,
                       p_mdis );
 
+    libvlc_retain( p_inst );
     return p_mdis;
 }
 
@@ -347,6 +348,7 @@ libvlc_media_discoverer_release( libvlc_media_discoverer_t * p_mdis )
 
     vlc_dictionary_clear( &p_mdis->catname_to_submedialist, NULL, NULL );
     libvlc_event_manager_release( p_mdis->p_event_manager );
+    libvlc_release( p_mdis->p_libvlc_instance );
 
     free( p_mdis );
 }

lib/media_library.c

@@ -80,6 +80,7 @@ libvlc_media_library_new( libvlc_instance_t * p_inst )
         return NULL;
     }
 
+    libvlc_retain( p_inst );
     return p_mlib;
 }
 
@@ -94,6 +95,7 @@ void libvlc_media_library_release( libvlc_media_library_t * p_mlib )
         return;
 
     libvlc_event_manager_release( p_mlib->p_event_manager );
+    libvlc_release( p_mlib->p_libvlc_instance );
     free( p_mlib );
 }
 

lib/media_list.c

@@ -189,6 +189,7 @@ libvlc_media_list_new( libvlc_instance_t * p_inst )
     p_mlist->p_md = NULL;
     p_mlist->p_internal_md = NULL;
 
+    libvlc_retain( p_inst );
     return p_mlist;
 }
 
@@ -227,6 +228,7 @@ void libvlc_media_list_release( libvlc_media_list_t * p_mlist )
     vlc_mutex_destroy( &p_mlist->refcount_lock );
     vlc_array_clear( &p_mlist->items );
 
+    libvlc_release( p_mlist->p_libvlc_instance );
     free( p_mlist );
 }
 

lib/vlm.c

@@ -117,6 +117,7 @@ static void libvlc_vlm_release_internal( libvlc_instance_t *p_instance )
     p_instance->libvlc_vlm.p_event_manager = NULL;
     vlm_Delete( p_vlm );
     p_instance->libvlc_vlm.p_vlm = NULL;
+    libvlc_release( p_instance );
 }
 
 static int libvlc_vlm_init( libvlc_instance_t *p_instance )
@@ -174,6 +175,7 @@ static int libvlc_vlm_init( libvlc_instance_t *p_instance )
                          "intf-event", VlmEvent,
                          p_instance->libvlc_vlm.p_event_manager );
         p_instance->libvlc_vlm.pf_release = libvlc_vlm_release_internal;
+        libvlc_retain( p_instance );
     }
 
     return VLC_SUCCESS;