[gtranslator] Remove build warning

[Daniel Garcia Moreno <danigm src gnome org>]

commit ad25b3656ff5e6dd1dc808abac24cf8e8f9db52e
Author: Daniel García Moreno <danigm wadobo com>
Date:   Mon Oct 29 12:49:20 2018 +0100

    Remove build warning

 src/gtr-application.c   | 4 ++--
 src/gtr-header-dialog.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/gtr-application.c b/src/gtr-application.c
index dd7989b8..38fbcf7a 100644
--- a/src/gtr-application.c
+++ b/src/gtr-application.c
@@ -235,7 +235,7 @@ find_activated (GSimpleAction *action,
   GtrApplication *app = GTR_APPLICATION (user_data);
   GtrApplicationPrivate *priv = gtr_application_get_instance_private (app);
 
-  _gtr_actions_search_find (GTK_ACTION (action), priv->active_window);
+  _gtr_actions_search_find (NULL, priv->active_window);
 }
 
 static void
@@ -246,7 +246,7 @@ find_and_replace_activated (GSimpleAction *action,
   GtrApplication *app = GTR_APPLICATION (user_data);
   GtrApplicationPrivate *priv = gtr_application_get_instance_private (app);
 
-  _gtr_actions_search_replace (GTK_ACTION (action), priv->active_window);
+  _gtr_actions_search_replace (NULL, priv->active_window);
 }
 
 static void
diff --git a/src/gtr-header-dialog.c b/src/gtr-header-dialog.c
index 40eb5dbb..6f1a93e5 100644
--- a/src/gtr-header-dialog.c
+++ b/src/gtr-header-dialog.c
@@ -391,7 +391,7 @@ void
 gtr_show_header_dialog (GtrWindow * window)
 {
   static GtkWidget *dlg = NULL;
-  GtrTab *tab;
+  GtrTab *tab = NULL;
 
   tab = gtr_window_get_active_tab (window);
   g_return_if_fail (tab != NULL);