[gthumb] fixed some compiler warnings

[Paolo Bacchilega <paobac src gnome org>]

commit c7a808c063fae2e6e3e0cdae509575dcfde35f45
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Jun 25 19:29:34 2017 +0200

    fixed some compiler warnings

 extensions/file_tools/gth-file-tool-color-picker.c |    2 --
 extensions/image_viewer/gth-image-viewer-page.c    |    2 +-
 gthumb/gth-image-dragger.c                         |    4 ++--
 gthumb/gth-image-overview.c                        |    2 +-
 gthumb/gth-time-selector.c                         |    2 +-
 5 files changed, 5 insertions(+), 7 deletions(-)
---
diff --git a/extensions/file_tools/gth-file-tool-color-picker.c 
b/extensions/file_tools/gth-file-tool-color-picker.c
index eba138e..da2f5df 100644
--- a/extensions/file_tools/gth-file-tool-color-picker.c
+++ b/extensions/file_tools/gth-file-tool-color-picker.c
@@ -117,8 +117,6 @@ color_text_icon_press_cb (GtkEntry             *entry,
                          GdkEvent             *event,
                          gpointer              user_data)
 {
-       GthFileToolColorPicker *self = user_data;
-
        if (icon_pos == GTK_ENTRY_ICON_SECONDARY) {
                gtk_clipboard_set_text (gtk_clipboard_get_default (gtk_widget_get_display (GTK_WIDGET 
(entry))),
                                        gtk_entry_get_text (GTK_ENTRY (entry)),
diff --git a/extensions/image_viewer/gth-image-viewer-page.c b/extensions/image_viewer/gth-image-viewer-page.c
index a8c7af1..1ec6a6b 100644
--- a/extensions/image_viewer/gth-image-viewer-page.c
+++ b/extensions/image_viewer/gth-image-viewer-page.c
@@ -1029,7 +1029,7 @@ gth_image_viewer_page_real_activate (GthViewerPage *base,
        self->priv->preloader = gth_browser_get_image_preloader (browser);
 
        self->priv->viewer = gth_image_viewer_new ();
-       g_object_add_weak_pointer (G_OBJECT (self->priv->viewer), &self->priv->viewer);
+       g_object_add_weak_pointer (G_OBJECT (self->priv->viewer), (gpointer *) &self->priv->viewer);
        gtk_widget_add_events (self->priv->viewer, GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK);
        gth_image_viewer_page_reset_viewer_tool (self);
        gtk_widget_show (self->priv->viewer);
diff --git a/gthumb/gth-image-dragger.c b/gthumb/gth-image-dragger.c
index d6b14d8..546c766 100644
--- a/gthumb/gth-image-dragger.c
+++ b/gthumb/gth-image-dragger.c
@@ -169,7 +169,7 @@ gth_image_dragger_set_viewer (GthImageViewerTool *base,
        GthImageDragger *self = GTH_IMAGE_DRAGGER (base);
 
        self->priv->viewer = image_viewer;
-       g_object_add_weak_pointer (G_OBJECT (image_viewer), &self->priv->viewer);
+       g_object_add_weak_pointer (G_OBJECT (image_viewer), (gpointer *) &self->priv->viewer);
        if (self->priv->show_frame)
                gth_image_viewer_show_frame (self->priv->viewer, FRAME_BORDER);
 }
@@ -183,7 +183,7 @@ gth_image_dragger_unset_viewer (GthImageViewerTool *base,
 
        if ((self->priv->viewer != NULL) && self->priv->show_frame)
                gth_image_viewer_hide_frame (self->priv->viewer);
-       g_object_remove_weak_pointer (G_OBJECT (image_viewer), &self->priv->viewer);
+       g_object_remove_weak_pointer (G_OBJECT (image_viewer),  (gpointer *) &self->priv->viewer);
        self->priv->viewer = NULL;
 }
 
diff --git a/gthumb/gth-image-overview.c b/gthumb/gth-image-overview.c
index b91fc6b..ba76227 100644
--- a/gthumb/gth-image-overview.c
+++ b/gthumb/gth-image-overview.c
@@ -110,7 +110,7 @@ _gth_image_overviewer_disconnect_from_viewer (GthImageOverview *self)
        }
 
        if (self->priv->viewer != NULL) {
-               g_object_remove_weak_pointer (G_OBJECT (self->priv->viewer), &self->priv->viewer);
+               g_object_remove_weak_pointer (G_OBJECT (self->priv->viewer), (gpointer *) 
&self->priv->viewer);
                self->priv->viewer = NULL;
        }
 }
diff --git a/gthumb/gth-time-selector.c b/gthumb/gth-time-selector.c
index 9d6ffa6..aeb67b8 100644
--- a/gthumb/gth-time-selector.c
+++ b/gthumb/gth-time-selector.c
@@ -92,7 +92,7 @@ gth_time_selector_unmap (GtkWidget *widget)
 }
 
 
-gboolean
+static gboolean
 gth_time_selector_real_focus (GtkWidget        *base,
                              GtkDirectionType  direction)
 {