If the timeout is 0, we can get None back. Handle this explicitly.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 python/qemu/lib/machine.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/python/qemu/lib/machine.py b/python/qemu/lib/machine.py
index 8548c7c32d..61ee3a0e81 100644
--- a/python/qemu/lib/machine.py
+++ b/python/qemu/lib/machine.py
@@ -32,7 +32,7 @@
 from types import TracebackType
 
 from . import qmp
-from .qmp import SocketAddrT
+from .qmp import SocketAddrT, QMPMessage
 
 LOG = logging.getLogger(__name__)
 
@@ -519,6 +519,8 @@ def _match(event):
                     return True
             return False
 
+        event: Optional[QMPMessage]
+
         # Search cached events
         for event in self._events:
             if _match(event):
@@ -528,6 +530,8 @@ def _match(event):
         # Poll for new events
         while True:
             event = self._qmp.pull_event(wait=timeout)
+            if event is None:
+                break
             if _match(event):
                 return event
             self._events.append(event)
-- 
2.21.1