[gnome-builder] foundry: fix missing return

[Christian Hergert <chergert src gnome org>]

commit d3cbd8865fc439c72770cb89e87b550c94514a38
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 19 12:39:26 2019 -0700

    foundry: fix missing return

 src/libide/foundry/ide-build-system.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libide/foundry/ide-build-system.c b/src/libide/foundry/ide-build-system.c
index 8baa6506c..a1339797b 100644
--- a/src/libide/foundry/ide-build-system.c
+++ b/src/libide/foundry/ide-build-system.c
@@ -147,6 +147,7 @@ ide_build_system_real_get_build_flags_async (IdeBuildSystem      *self,
                                  G_IO_ERROR_NOT_SUPPORTED,
                                  "Cannot extract build flags for unknown file type: \"%s\"",
                                  path);
+      return;
     }
 
   if (flags == NULL)