fixing typo

app.py

@@ -26,7 +26,7 @@ def inference(audio_file, model_name, guidance_scale, ddim_steps, seed):
         ddim_steps=ddim_steps
     )
 
-    if torch.cuda.is_avaible():
+    if torch.cuda.is_available():
         torch.cuda.empty_cache()
 
     gc.collect()