Moved from guint to gint to match libical internal data.

The internal attributes of both widgets were guint types, but
since libical library has those values (day,month,hour) as int
inside icaltimetype struct, I decided t move to gint in order to
avoid compiler warnings, and ugly hidden things.

src/gcal-time-entry.c

@@ -25,8 +25,8 @@ struct _GcalTimeEntryPrivate
 {
   gboolean internal_delete;
 
-  guint    hours;
-  guint    minutes;
+  gint    hours;
+  gint    minutes;
 };
 
 static void     gtk_editable_iface_init                        (GtkEditableInterface *iface);
@@ -292,9 +292,9 @@ gcal_time_entry_insert_text (GtkEditable *editable,
 
   /* setting hours, minutes */
   hours_text = g_strdup_printf ("%.2s", old_text);
-  priv->hours = (guint) g_ascii_strtoull (hours_text, NULL, 10);
+  priv->hours = (gint) g_ascii_strtoull (hours_text, NULL, 10);
   g_free (hours_text);
-  priv->minutes = (guint) g_ascii_strtoull (old_text + 3, NULL, 10);
+  priv->minutes = (gint) g_ascii_strtoull (old_text + 3, NULL, 10);
 
   priv->internal_delete = TRUE;
   gtk_editable_delete_text (editable, 0, 5);
@@ -322,8 +322,8 @@ gcal_time_entry_new (void)
 
 void
 gcal_time_entry_set_time (GcalTimeEntry *entry,
-                          guint          hours,
-                          guint          minutes)
+                          gint           hours,
+                          gint           minutes)
 {
   GcalTimeEntryPrivate *priv;
   gchar *new_time;
@@ -343,8 +343,8 @@ gcal_time_entry_set_time (GcalTimeEntry *entry,
 
 void
 gcal_time_entry_get_time (GcalTimeEntry *entry,
-                          guint         *hours,
-                          guint         *minutes)
+                          gint          *hours,
+                          gint          *minutes)
 {
   GcalTimeEntryPrivate *priv;