avoid goroutine leak after timeout (#575)

core/fx/timeout.go

@@ -26,7 +26,8 @@ func DoWithTimeout(fn func() error, timeout time.Duration, opts ...DoOption) err
 	ctx, cancel := contextx.ShrinkDeadline(parentCtx, timeout)
 	defer cancel()
 
-	done := make(chan error)
+	// create channel with buffer size 1 to avoid goroutine leak
+	done := make(chan error, 1)
 	panicChan := make(chan interface{}, 1)
 	go func() {
 		defer func() {
@@ -35,7 +36,6 @@ func DoWithTimeout(fn func() error, timeout time.Duration, opts ...DoOption) err
 			}
 		}()
 		done <- fn()
-		close(done)
 	}()
 
 	select {