Fix leak of Reference-inherited objects

Author: endragor

godot.nimble

@@ -1,7 +1,7 @@
-version = "0.8.2"
+version = "0.8.3"
 author = "Xored Software, Inc."
 description = "Godot Engine bindings"
 license = "MIT"
 srcDir = "godot"
 
-requires "nim >= 0.17.3", "compiler >= 0.17.3"
+requires "nim >= 0.17.3", "compiler >= 0.17.3"

godot/nim/godotnim.nim

@@ -196,6 +196,8 @@ proc nimGodotObjectFinalizer*[T: NimGodotObject](obj: T) =
   obj.isFinalized = true
   if (obj.isRef or not obj.linkedObject.isNil and obj.linkedObject.isRef) and
      obj.godotObject.unreference():
+    if not obj.linkedObject.isNil:
+      GC_unref(obj.linkedObject)
     obj.deinit()
 
 macro baseNativeType(T: typedesc): cstring =