Fix -Werror=cast-function-type with GCC 8

In addition, it removes unnecessary function type casts like:
  (GDestroyNotify) g_object_unref
  (GDestroyNotify) g_free

4 files changed, 9 insertions, 14 deletions

diff --git a/logview/src/logview-app.c b/logview/src/logview-app.c
index ffa37ec7..6d30e682 100644
--- a/logview/src/logview-app.c
+++ b/logview/src/logview-app.c
@@ -145,8 +145,7 @@ enumerate_job_finish (EnumerateJob *job)
 
   logview_manager_add_logs_from_name_list (app->priv->manager, files, files->data);
 
-  g_slist_foreach (files, (GFunc) g_free, NULL);
-  g_slist_free (files);
+  g_slist_free_full (files, g_free);
 
   g_object_unref (job->app);
   g_slice_free (EnumerateJob, job);
diff --git a/logview/src/logview-log.c b/logview/src/logview-log.c
index 407f49c3..a27202de 100644
--- a/logview/src/logview-log.c
+++ b/logview/src/logview-log.c
@@ -115,9 +115,8 @@ do_finalize (GObject *obj)
   }
 
   if (log->priv->days) {
-    g_slist_foreach (log->priv->days,
-                     (GFunc) logview_utils_day_free, NULL);
-    g_slist_free (log->priv->days);
+    g_slist_free_full (log->priv->days,
+                       (GDestroyNotify) logview_utils_day_free);
     log->priv->days = NULL;
   }
 
@@ -256,8 +255,7 @@ new_lines_job_done (gpointer data)
 
   g_clear_object (&job->cancellable);
 
-  g_slist_foreach (job->new_days, (GFunc) logview_utils_day_free, NULL);
-  g_slist_free (job->new_days);
+  g_slist_free_full (job->new_days, (GDestroyNotify) logview_utils_day_free);
 
   /* drop the reference we acquired before */
   g_object_unref (job->log);
@@ -758,8 +756,7 @@ log_load (GIOSchedulerJob *io_job,
 
     if ((days = log_read_dates (parse_data, time (NULL))) != NULL) {
       log->priv->has_days = TRUE;
-      g_slist_foreach (days, (GFunc) logview_utils_day_free, NULL);
-      g_slist_free (days);
+      g_slist_free_full (days, (GDestroyNotify) logview_utils_day_free);
     } else {
       log->priv->has_days = FALSE;
     }
diff --git a/logview/src/logview-manager.c b/logview/src/logview-manager.c
index 54b5320b..ca1c423f 100644
--- a/logview/src/logview-manager.c
+++ b/logview/src/logview-manager.c
@@ -128,7 +128,7 @@ logview_manager_init (LogviewManager *self)
 
   priv->active_log = NULL;
   priv->logs = g_hash_table_new_full (g_str_hash, g_str_equal, 
-                                      (GDestroyNotify) g_free, (GDestroyNotify) g_object_unref);
+                                      g_free, g_object_unref);
 }
 
 static MultipleCreation *
@@ -147,9 +147,8 @@ multiple_creation_op_new (int total)
 static void
 multiple_creation_op_free (MultipleCreation *mc)
 {
-  g_ptr_array_foreach (mc->errors, (GFunc) g_strfreev, NULL);
+  g_ptr_array_set_free_func (mc->errors, (GDestroyNotify) g_strfreev);
   g_ptr_array_free (mc->errors, TRUE);
-
   g_slice_free (MultipleCreation, mc);
 }
 
diff --git a/logview/src/logview-prefs.c b/logview/src/logview-prefs.c
index e0fe79c2..877936a8 100644
--- a/logview/src/logview-prefs.c
+++ b/logview/src/logview-prefs.c
@@ -161,8 +161,8 @@ load_filters (LogviewPrefs *prefs)
                                  PREF_FILTERS);
 
   prefs->priv->filters = g_hash_table_new_full (g_str_hash, g_str_equal,
-                                                (GDestroyNotify) g_free,
-                                                (GDestroyNotify) g_object_unref);
+                                                g_free,
+                                                g_object_unref);
 
   for (idx = 0; filters[idx] != NULL; idx++) {
     str = filters[idx];