[latexila] Fix new Vala compilation errors

[Sébastien Wilmet <swilmet src gnome org>]

commit 5c8344b1386cd2248d3cfff111766697d30e2348
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Mar 11 14:44:49 2017 +0100

    Fix new Vala compilation errors

 src/build_tool_dialog.vala       |    2 +-
 src/build_tools_preferences.vala |    2 +-
 src/project_dialogs.vala         |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/build_tool_dialog.vala b/src/build_tool_dialog.vala
index 6a22e14..d76f566 100644
--- a/src/build_tool_dialog.vala
+++ b/src/build_tool_dialog.vala
@@ -305,7 +305,7 @@ public class BuildToolDialog : GLib.Object
             TreeIter iter;
             int selected_row = Utils.get_selected_row (_jobs_view, out iter);
             if (selected_row >= 0)
-                _jobs_store.remove (iter);
+                _jobs_store.remove (ref iter);
         });
 
         return remove_button;
diff --git a/src/build_tools_preferences.vala b/src/build_tools_preferences.vala
index 7dc877a..d01c904 100644
--- a/src/build_tools_preferences.vala
+++ b/src/build_tools_preferences.vala
@@ -337,7 +337,7 @@ public class BuildToolsPreferences : GLib.Object
 
             if (dialog.run () == ResponseType.YES)
             {
-                _personal_store.remove (iter);
+                _personal_store.remove (ref iter);
                 Latexila.BuildToolsPersonal.get_instance ().delete (selected_row);
             }
 
diff --git a/src/project_dialogs.vala b/src/project_dialogs.vala
index 96f6ae1..6424837 100644
--- a/src/project_dialogs.vala
+++ b/src/project_dialogs.vala
@@ -278,7 +278,7 @@ namespace ProjectDialogs
 
             if (delete_dialog.run () == ResponseType.YES)
             {
-                store.remove (iter);
+                store.remove (ref iter);
                 Projects.get_default ().delete (i);
             }