Rename load_meta to self.load_meta in inference.py (metavoiceio#75)

`load_meta` is not defined and can introduce a runtime error when it is only assigned in a conditional branch.

Signed-off-by: Hongbo <12580159+ya0guang@users.noreply.github.com>

fam/llm/inference.py

@@ -112,9 +112,9 @@ def _init_model(self):
                 self.checkpoint_config = checkpoint["config"]
 
                 self.meta = checkpoint["meta"]
-                load_meta = True
+                self.load_meta = True
 
-            if load_meta:
+            if self.load_meta:
                 self.use_bpe_tokenizer = "stoi" not in self.meta or "itos" not in self.meta
                 self.speaker_cond = self.meta.get("speaker_cond")