Close qmemman client with correct handler

For: QubesOS/qubes-issues#1512

Author: ben-grande

qubes/vm/dispvm.py

@@ -611,7 +611,6 @@ async def on_domain_pre_paused(self, event, **kwargs) -> None:
             return
         if self.preload_requested:
             return
-        qmemman_client = None
         break_task = asyncio.create_task(self.preload_requested_event.wait())
         qmemman_task = asyncio.get_event_loop().run_in_executor(
             None, self.set_mem
@@ -627,14 +626,14 @@ async def on_domain_pre_paused(self, event, **kwargs) -> None:
                 else:
                     break_task.cancel()
         except asyncio.CancelledError:
-            if qmemman_client:
-                qmemman_client.close()
+            if qmemman_task:
+                qmemman_task.close()
         except Exception as exc:
             self.log.warning(
                 "Preload memory request before pause failed: %s", str(exc)
             )
-            if qmemman_client:
-                qmemman_client.close()
+            if qmemman_task:
+                qmemman_task.close()
             raise
         finally:
             if self.preload_requested: