[gnome-builder] symbol-tree: Fix whitespace in error message

[Patrick Griffis <pgriffis src gnome org>]

commit a01b921858f1076c0bf0f11fbc05793f571799d4
Author: Patrick Griffis <tingping tingping se>
Date:   Tue Sep 12 13:08:16 2017 -0400

    symbol-tree: Fix whitespace in error message

 .../symbol-tree/gbp-symbol-layout-stack-addin.c    |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c 
b/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
index 1392da4..ec01a55 100644
--- a/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
+++ b/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
@@ -239,7 +239,7 @@ gbp_symbol_layout_stack_addin_get_symbol_tree_cb (GObject      *object,
   if (error != NULL &&
       !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED) &&
       !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED))
-    g_warning ("Failed to get symbol tree%s", error->message);
+    g_warning ("Failed to get symbol tree: %s", error->message);
 
   /* If we were destroyed, short-circuit */
   if (self->button != NULL)