server/authorizer: inline readBody (open-policy-agent#6156)

This was a waste of space.

Signed-off-by: Stephan Renatus <stephan@styra.com>

server/authorizer/authorizer.go

@@ -163,7 +163,8 @@ func makeInput(r *http.Request) (*http.Request, interface{}, error) {
 	var rawBody []byte
 
 	if expectBody(r.Method, path) {
-		rawBody, err = readBody(r)
+		var err error
+		rawBody, err = io.ReadAll(r.Body)
 		if err != nil {
 			return r, nil, err
 		}
@@ -232,17 +233,6 @@ func expectYAML(r *http.Request) bool {
 	return strings.Contains(r.Header.Get("Content-Type"), "yaml")
 }
 
-func readBody(r *http.Request) ([]byte, error) {
-
-	bs, err := io.ReadAll(r.Body)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return bs, nil
-}
-
 func parsePath(path string) ([]interface{}, error) {
 	if len(path) == 0 {
 		return []interface{}{}, nil