get rid of warnings

callbacks.c

@@ -9,6 +9,7 @@
 #include "render.h"
 #include "document.h"
 #include "utils.h"
+#include "shortcuts.h"
 
 gboolean
 cb_destroy(GtkWidget* UNUSED(widget), gpointer UNUSED(data))
@@ -92,7 +93,7 @@ cb_pages_per_row_value_changed(girara_session_t* UNUSED(session), girara_setting
 
 void
 cb_index_row_activated(GtkTreeModel* tree_view, GtkTreePath* path,
-    GtkTreeViewColumn* column, zathura_t* zathura)
+    GtkTreeViewColumn* UNUSED(column), zathura_t* zathura)
 {
   if (tree_view == NULL || zathura == NULL || zathura->ui.session == NULL) {
     return;

utils.c

@@ -68,7 +68,7 @@ file_valid_extension(zathura_t* zathura, const char* path)
     }
   GIRARA_LIST_FOREACH_END(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
 
-  g_free(content_type);
+  g_free((void*)content_type);
   return result;
 }
 

zathura.c

@@ -63,11 +63,13 @@ zathura_init(int argc, char* argv[])
 
   /* plugins */
   zathura->plugins.plugins = girara_list_new();
-  girara_list_set_free_function(zathura->plugins.plugins, zathura_document_plugin_free);
+  girara_list_set_free_function(zathura->plugins.plugins, 
+      (girara_free_function_t)zathura_document_plugin_free);
   zathura->plugins.path    = girara_list_new();
   girara_list_set_free_function(zathura->plugins.path, g_free);
   zathura->plugins.type_plugin_mapping = girara_list_new();
-  girara_list_set_free_function(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_free);
+  girara_list_set_free_function(zathura->plugins.type_plugin_mapping,
+      (girara_free_function_t)zathura_type_plugin_mapping_free);
 
   if (config_dir) {
     zathura->config.config_dir = g_strdup(config_dir);