[gnome-builder] pipeline: ensure we stash top Enter directory

[Christian Hergert <chergert src gnome org>]

commit b6cd0397ec7cb93e4db9d40cba9132fff9655b2a
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jan 23 02:37:49 2018 -0800

    pipeline: ensure we stash top Enter directory

 src/libide/buildsystem/ide-build-pipeline.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/libide/buildsystem/ide-build-pipeline.c b/src/libide/buildsystem/ide-build-pipeline.c
index 5df2c3fe4..2d59396a0 100644
--- a/src/libide/buildsystem/ide-build-pipeline.c
+++ b/src/libide/buildsystem/ide-build-pipeline.c
@@ -570,6 +570,9 @@ extract_directory_change (IdeBuildPipeline *self,
       else
         self->errfmt_current_dir = g_strndup (dir, len);
 
+      if (self->errfmt_top_dir == NULL)
+        self->errfmt_top_dir = g_strdup (self->errfmt_current_dir);
+
       return TRUE;
     }