[gnome-builder] build: fix some build warnings

[Christian Hergert <chergert src gnome org>]

commit dd924fab954cddcfa8403c36833554e5b41721c2
Author: Christian Hergert <christian hergert me>
Date:   Tue Mar 24 02:06:50 2015 -0700

    build: fix some build warnings

 libide/devhelp/ide-devhelp-search-provider.c |    2 +-
 libide/ide-buffer-manager.c                  |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libide/devhelp/ide-devhelp-search-provider.c b/libide/devhelp/ide-devhelp-search-provider.c
index 3a0b466..b11cea1 100644
--- a/libide/devhelp/ide-devhelp-search-provider.c
+++ b/libide/devhelp/ide-devhelp-search-provider.c
@@ -53,7 +53,7 @@ ide_devhelp_search_provider_populate (IdeSearchProvider *provider,
   IdeContext *idecontext;
   GtkTreeIter iter;
   gboolean valid;
-  gint count = 0;;
+  gint count = 0;
   gint total;
 
   g_assert (IDE_IS_DEVHELP_SEARCH_PROVIDER (self));
diff --git a/libide/ide-buffer-manager.c b/libide/ide-buffer-manager.c
index ba67832..baa9679 100644
--- a/libide/ide-buffer-manager.c
+++ b/libide/ide-buffer-manager.c
@@ -1453,7 +1453,7 @@ ide_buffer_manager_create_buffer (IdeBufferManager *self)
   GFile *workdir;
   guint doc_seq;
 
-  g_return_if_fail (IDE_IS_BUFFER_MANAGER (self));
+  g_return_val_if_fail (IDE_IS_BUFFER_MANAGER (self), NULL);
 
   context = ide_object_get_context (IDE_OBJECT (self));
   vcs = ide_context_get_vcs (context);