Fix DPP + SyncBN

Ensure that model is already on correct GPU before applying SyncBN conversion

pytorch_lightning/plugins/training_type/ddp.py

@@ -241,12 +241,12 @@ def init_ddp_connection(self, global_rank: int, world_size: int) -> None:
             torch_distrib.init_process_group(self.torch_distributed_backend, rank=global_rank, world_size=world_size)
 
     def pre_dispatch(self):
-        if self.sync_batchnorm:
-            self.model = self.configure_sync_batchnorm(self.model)
-
         # move the model to the correct device
         self.model_to_device()
 
+        if self.sync_batchnorm:
+            self.model = self.configure_sync_batchnorm(self.model)
+
         self.configure_ddp()
 
         self.barrier()