[gnome-builder] rust-analyzer: handle reaching / gracefully

[Christian Hergert <chergert src gnome org>]

commit 732cf3907cecc993efc64770b4758290cbe52fe6
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 3 21:55:02 2021 -0800

    rust-analyzer: handle reaching / gracefully

 .../rust-analyzer/rust-analyzer-pipeline-addin.c        | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)
---
diff --git a/src/plugins/rust-analyzer/rust-analyzer-pipeline-addin.c 
b/src/plugins/rust-analyzer/rust-analyzer-pipeline-addin.c
index 8bb26ba22..063f7db2c 100644
--- a/src/plugins/rust-analyzer/rust-analyzer-pipeline-addin.c
+++ b/src/plugins/rust-analyzer/rust-analyzer-pipeline-addin.c
@@ -73,17 +73,20 @@ find_cargo_toml_from_file (GFile *file)
   if (file != NULL)
     {
       g_autoptr(GFile) parent = g_file_get_parent (file);
-      g_autoptr(GFile) cargo_toml = g_file_get_child (parent, "Cargo.toml");
       g_autofree gchar *name = g_file_get_basename (file);
 
-      if (g_strcmp0 (name, "Cargo.toml") == 0)
-        return g_steal_pointer (&parent);
+      if (parent != NULL)
+        {
+          g_autoptr(GFile) cargo_toml = g_file_get_child (parent, "Cargo.toml");
 
-      if (g_file_query_exists (cargo_toml, NULL))
-        return g_steal_pointer (&cargo_toml);
+          if (g_strcmp0 (name, "Cargo.toml") == 0)
+            return g_steal_pointer (&parent);
 
-      if (parent != NULL)
-        return find_cargo_toml_from_file (parent);
+          if (g_file_query_exists (cargo_toml, NULL))
+            return g_steal_pointer (&cargo_toml);
+
+          return find_cargo_toml_from_file (parent);
+        }
     }
 
   return NULL;