Add correct comment, remove redundant vars and error, use short form (#3206)

Author: sashamelentyev

runtime/mux.go

@@ -80,7 +80,7 @@ func WithForwardResponseOption(forwardResponseOption func(context.Context, http.
 	}
 }
 
-// WithEscapingType sets the escaping type. See the definitions of UnescapingMode
+// WithUnescapingMode sets the escaping type. See the definitions of UnescapingMode
 // for more information.
 func WithUnescapingMode(mode UnescapingMode) ServeMuxOption {
 	return func(serveMux *ServeMux) {
@@ -231,7 +231,6 @@ func WithHealthEndpointAt(healthCheckClient grpc_health_v1.HealthClient, endpoin
 				w.Header().Set("Content-Type", "application/json")
 
 				if resp.GetStatus() != grpc_health_v1.HealthCheckResponse_SERVING {
-					var err error
 					switch resp.GetStatus() {
 					case grpc_health_v1.HealthCheckResponse_NOT_SERVING, grpc_health_v1.HealthCheckResponse_UNKNOWN:
 						err = status.Error(codes.Unavailable, resp.String())

runtime/pattern.go

@@ -15,8 +15,6 @@ var (
 	ErrNotMatch = errors.New("not match to the path pattern")
 	// ErrInvalidPattern indicates that the given definition of Pattern is not valid.
 	ErrInvalidPattern = errors.New("invalid pattern")
-	// ErrMalformedSequence indicates that an escape sequence was malformed.
-	ErrMalformedSequence = errors.New("malformed escape sequence")
 )
 
 type MalformedSequenceError string

runtime/query.go

@@ -47,8 +47,7 @@ type DefaultQueryParser struct{}
 // A value is ignored if its key starts with one of the elements in "filter".
 func (*DefaultQueryParser) Parse(msg proto.Message, values url.Values, filter *utilities.DoubleArray) error {
 	for key, values := range values {
-		match := valuesKeyRegexp.FindStringSubmatch(key)
-		if len(match) == 3 {
+		if match := valuesKeyRegexp.FindStringSubmatch(key); len(match) == 3 {
 			key = match[1]
 			values = append([]string{match[2]}, values...)
 		}
@@ -321,15 +320,13 @@ func parseMessage(msgDescriptor protoreflect.MessageDescriptor, value string) (p
 		msg = fm
 	case "google.protobuf.Value":
 		var v structpb.Value
-		err := protojson.Unmarshal([]byte(value), &v)
-		if err != nil {
+		if err := protojson.Unmarshal([]byte(value), &v); err != nil {
 			return protoreflect.Value{}, err
 		}
 		msg = &v
 	case "google.protobuf.Struct":
 		var v structpb.Struct
-		err := protojson.Unmarshal([]byte(value), &v)
-		if err != nil {
+		if err := protojson.Unmarshal([]byte(value), &v); err != nil {
 			return protoreflect.Value{}, err
 		}
 		msg = &v