osm json, fix type regex matching

json.go

@@ -27,7 +27,7 @@ import (
 // Note that any errors encountered during marshaling will be different.
 var CustomJSONMarshaler interface {
 	Marshal(v interface{}) ([]byte, error)
-} = nil
+}
 
 // CustomJSONUnmarshaler can be set to have the code use a different
 // json unmarshaler than the default in the standard library.
@@ -51,7 +51,7 @@ var CustomJSONMarshaler interface {
 // Note that any errors encountered during unmarshaling will be different.
 var CustomJSONUnmarshaler interface {
 	Unmarshal(data []byte, v interface{}) error
-} = nil
+}
 
 func marshalJSON(v interface{}) ([]byte, error) {
 	if CustomJSONMarshaler == nil {

osm.go

@@ -370,7 +370,7 @@ func (o *OSM) UnmarshalJSON(data []byte) error {
 var jsonTypeRegexp = regexp.MustCompile(`"type"\s*:\s*"([^"]*)"`)
 
 func findType(index int, data []byte) (string, error) {
-	matches := jsonTypeRegexp.FindAllSubmatch(data, -1)
+	matches := jsonTypeRegexp.FindAllSubmatch(data, 1)
 	if len(matches) > 0 {
 		return string(matches[0][1]), nil
 	}