[gnome-builder] meson: fix critical in ninja lookup

[Christian Hergert <chergert src gnome org>]

commit 0f771afe0117073a3bf3d852df8bb1b1116a1576
Author: Christian Hergert <chergert redhat com>
Date:   Sun Feb 28 16:15:38 2021 -0800

    meson: fix critical in ninja lookup

 src/plugins/meson/gbp-meson-pipeline-addin.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/meson/gbp-meson-pipeline-addin.c b/src/plugins/meson/gbp-meson-pipeline-addin.c
index 8e9aae305..d2786ab2a 100644
--- a/src/plugins/meson/gbp-meson-pipeline-addin.c
+++ b/src/plugins/meson/gbp-meson-pipeline-addin.c
@@ -147,7 +147,8 @@ gbp_meson_pipeline_addin_load (IdePipelineAddin *addin,
   g_assert (IDE_IS_RUNTIME (runtime));
   g_assert (srcdir != NULL);
 
-  for (guint i = 0; i < G_N_ELEMENTS (ninja_names); i++)
+  /* Requires NULL check so we can use g_strv_contains() elsewhere */
+  for (guint i = 0; ninja_names[i]; i++)
     {
       if (ide_runtime_contains_program_in_path (runtime, ninja_names[i], NULL))
         {