week-grid, week-header: simplify code

We don't need to check whether the end date is NULL,
for GcalEvent always ensures that.

src/views/gcal-week-grid.c

@@ -1008,6 +1008,7 @@ gcal_week_grid_drag_drop (GtkWidget      *widget,
   GcalWeekGrid *self;
   g_autoptr (GDateTime) week_start;
   g_autoptr (GDateTime) dnd_date;
+  g_autoptr (GDateTime) new_end;
   GtkWidget *event_widget;
   GcalEvent *event;
   GTimeSpan timespan = 0;
@@ -1043,8 +1044,7 @@ gcal_week_grid_drag_drop (GtkWidget      *widget,
    * Calculate the diff between the dropped cell and the event's start date,
    * so we can update the end date accordingly.
    */
-  if (gcal_event_get_date_end (event))
-    timespan = g_date_time_difference (gcal_event_get_date_end (event), gcal_event_get_date_start (event));
+  timespan = g_date_time_difference (gcal_event_get_date_end (event), gcal_event_get_date_start (event));
 
   /*
    * Set the event's start and end dates. Since the event may have a
@@ -1053,12 +1053,10 @@ gcal_week_grid_drag_drop (GtkWidget      *widget,
   gcal_event_set_all_day (event, FALSE);
   gcal_event_set_date_start (event, dnd_date);
 
-  if (gcal_event_get_date_end (event))
-    {
-      g_autoptr (GDateTime) new_end = g_date_time_add (dnd_date, timespan);
 
-      gcal_event_set_date_end (event, new_end);
-    }
+  /* Setup the new end date */
+  new_end = g_date_time_add (dnd_date, timespan);
+  gcal_event_set_date_end (event, new_end);
 
   /* Commit the changes */
   gcal_manager_update_event (self->manager, event);

src/views/gcal-week-header.c

@@ -1402,8 +1402,10 @@ gcal_week_header_drag_drop (GtkWidget      *widget,
   GcalWeekHeader *self;
   g_autoptr (GDateTime) week_start;
   g_autoptr (GDateTime) dnd_date;
+  g_autoptr (GDateTime) new_end;
   GDateTime *start_date;
   GDateTime *end_date;
+  GTimeSpan difference;
   GtkWidget *event_widget;
   GcalEvent *event;
   gboolean turn_all_day;
@@ -1455,20 +1457,11 @@ gcal_week_header_drag_drop (GtkWidget      *widget,
                                       0, 0, 0);
     }
 
-  /* Since the event may have a NULL end date, so we have to check it here */
-  if (end_date)
-    {
-      g_autoptr (GDateTime) new_end;
-      GTimeSpan difference;
+  /* End date */
+  difference = turn_all_day ? 24 : g_date_time_difference (end_date, start_date) / G_TIME_SPAN_HOUR;
 
-      if (turn_all_day)
-        difference = 24;
-      else
-        difference = g_date_time_difference (end_date, start_date) / G_TIME_SPAN_HOUR;
-
-      new_end = g_date_time_add_hours (dnd_date, difference);
-      gcal_event_set_date_end (event, new_end);
-    }
+  new_end = g_date_time_add_hours (dnd_date, difference);
+  gcal_event_set_date_end (event, new_end);
 
   /*
    * Set the start date ~after~ the end date, so we can compare