fix restricting video upload to wifi

selfdrive/loggerd/uploader.py

@@ -248,19 +248,18 @@ def uploader_fn(exit_event):
 
   uploader = Uploader(dongle_id, access_token, ROOT)
 
+  backoff = 0.1
   while True:
 
     upload_video = (params.get("IsUploadVideoOverCellularEnabled") != "0") or is_on_wifi()
 
-    backoff = 0.1
-    while True:
-
     if exit_event.is_set():
       return
 
     d = uploader.next_file_to_upload(upload_video)
     if d is None:
-        break
+      time.sleep(5)
+      continue
 
     key, fn, _ = d
 
@@ -274,8 +273,6 @@ def uploader_fn(exit_event):
       backoff = min(backoff*2, 120)
     cloudlog.info("upload done, success=%r", success)
 
-    time.sleep(5)
-
 def main(gctx=None):
   uploader_fn(threading.Event())