exit BatchedSubManyEose() immediately as the context expires.

I'm not sure about this, but seems to work.

pool.go

@@ -777,9 +777,10 @@ func (pool *SimplePool) BatchedSubManyEose(
 				select {
 				case res <- ie:
 				case <-ctx.Done():
+					wg.Done()
+					return
 				}
 			}
-
 			wg.Done()
 		}(df)
 	}