[gtk+] popover: Initialize some locals

[Timm Bäder <baedert src gnome org>]

commit 619ee3797dad3fe2f24db1ff5ae2922e332ce158
Author: Timm Bäder <mail baedert org>
Date:   Mon Aug 28 11:15:58 2017 +0200

    popover: Initialize some locals
    
    gtk_popover_get_pointing_to does not fill the given rect in every case.

 gtk/gtkpopover.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index 84f034b..5bc10c8 100644
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -813,7 +813,7 @@ gtk_popover_get_gap_coords (GtkPopover      *popover,
 {
   GtkWidget *widget = GTK_WIDGET (popover);
   GtkPopoverPrivate *priv = popover->priv;
-  GdkRectangle rect;
+  GdkRectangle rect = { 0 };
   gint base, tip, tip_pos;
   gint initial_x, initial_y;
   gint tip_x, tip_y;
@@ -1104,7 +1104,7 @@ gtk_popover_update_position (GtkPopover *popover)
   GtkWidget *widget = GTK_WIDGET (popover);
   GtkAllocation window_alloc;
   GtkBorder window_shadow;
-  GdkRectangle rect;
+  GdkRectangle rect = { 0 };
   GtkRequisition req;
   GtkPositionType pos;
   gint overshoot[4];