[gnome-builder] clang: don't leak source location when creating diagnostic

[Christian Hergert <chergert src gnome org>]

commit d4934a954eaae6fb0d6f71e25dee6e3f72a6f2f4
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jan 3 04:57:07 2018 -0800

    clang: don't leak source location when creating diagnostic

 src/plugins/clang/ide-clang-translation-unit.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/clang/ide-clang-translation-unit.c b/src/plugins/clang/ide-clang-translation-unit.c
index a3adf98..e5cb6e5 100644
--- a/src/plugins/clang/ide-clang-translation-unit.c
+++ b/src/plugins/clang/ide-clang-translation-unit.c
@@ -317,10 +317,10 @@ create_diagnostic (IdeClangTranslationUnit *self,
                    GFile                   *target,
                    CXDiagnostic            *cxdiag)
 {
+  g_autoptr(IdeSourceLocation) loc = NULL;
   enum CXDiagnosticSeverity cxseverity;
   IdeDiagnosticSeverity severity;
   IdeDiagnostic *diag;
-  IdeSourceLocation *loc;
   g_autofree gchar *spelling = NULL;
   CXString cxstr;
   CXSourceLocation cxloc;