fix: return the correct error

This was causing cancel errors to be printed twice.

Author: Stebalien

http/client.go

@@ -96,7 +96,7 @@ func (c *client) Execute(req *cmds.Request, re cmds.ResponseEmitter, env cmds.En
 				return nil
 			}
 
-			return err
+			return closeErr
 		}
 	}