lint fixes (#14)

* lint fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

proxy/grpc/grpc.go

@@ -143,6 +143,7 @@ func (p *Proxy) serveRequest(ctx context.Context, link client.Client, service, e
 
 	// new context with cancel
 	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
 
 	// create new stream
 	stream, err := link.Stream(ctx, creq, opts...)

proxy/http/http.go

@@ -21,9 +21,6 @@ type Proxy struct {
 
 	// The http backend to call
 	Endpoint string
-
-	// first request
-	first bool
 }
 
 func getMethod(hdr map[string]string) string {

proxy/mucp/mucp.go

@@ -517,6 +517,7 @@ func (p *Proxy) serveRequest(ctx context.Context, link client.Client, service, e
 
 	// new context with cancel
 	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
 
 	// create new stream
 	stream, err := link.Stream(ctx, creq, opts...)