internal/lsp: fix error handling in cmd

Found unnecessary error handling so removed.

Change-Id: I1a48e73186425291fdb0ede963b92ef6c9ce0ed8
GitHub-Last-Rev: d5cf67c
GitHub-Pull-Request: #84
Reviewed-on: https://go-review.googlesource.com/c/tools/+/173097
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

internal/lsp/cmd/cmd.go

@@ -145,9 +145,6 @@ func (app *Application) connect(ctx context.Context, client cmdClient) (protocol
 		stream := jsonrpc2.NewHeaderStream(conn, conn)
 		var jc *jsonrpc2.Conn
 		jc, server, _ = protocol.NewClient(stream, client)
-		if err != nil {
-			return nil, err
-		}
 		go jc.Run(ctx)
 	}