daemon: Daemon.killWithSignal(): don't discard handleContainerExit error

Daemon.handleContainerExit() returns an error if snapshotting the container's
state to disk fails. There's not much we can do with the error if it occurs,
but let's log the error if that happens, instead of discarding it.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/kill.go

@@ -111,7 +111,13 @@ func (daemon *Daemon) killWithSignal(container *containerpkg.Container, stopSign
 				defer cancel()
 				s := <-container.Wait(ctx, containerpkg.WaitConditionNotRunning)
 				if s.Err() != nil {
-					daemon.handleContainerExit(container, nil)
+					if err := daemon.handleContainerExit(container, nil); err != nil {
+						log.G(context.TODO()).WithFields(log.Fields{
+							"error":     err,
+							"container": container.ID,
+							"action":    "kill",
+						}).Warn("error while handling container exit")
+					}
 				}
 			}()
 		} else {