Only set connecting task to None once

pytec/pytec/aioclient.py

@@ -27,7 +27,8 @@ class Client:
             self._reader, self._writer = await self._connecting_task
         except asyncio.CancelledError:
             return False
-        self._connecting_task = None
+        finally:
+            self._connecting_task = None
 
         await self._check_zero_limits()
         return True
@@ -44,7 +45,6 @@ class Client:
         """Disconnect the client if connected, cancel connection if connecting"""
         if self._connecting_task is not None:
             self._connecting_task.cancel()
-            self._connecting_task = None
             return
 
         if self._writer is None: