Merge pull request #454 from ngtcp2/add-const

Add const to nghttp3_frame_settings.local_settings

Author: tatsuhiro-t

lib/nghttp3_frame.h

@@ -93,7 +93,7 @@ typedef struct nghttp3_frame_settings {
   nghttp3_settings_entry *iv;
   /* local_settings is set when sending SETTINGS frame.  It is not
      used on reception. */
-  nghttp3_settings *local_settings;
+  const nghttp3_settings *local_settings;
 } nghttp3_frame_settings;
 
 typedef struct nghttp3_frame_goaway {

lib/nghttp3_stream.c

@@ -342,7 +342,7 @@ int nghttp3_stream_write_settings(nghttp3_stream *stream,
     .niv = 3,
     .iv = ents,
   };
-  nghttp3_settings *local_settings = infr->local_settings;
+  const nghttp3_settings *local_settings = infr->local_settings;
   int64_t payloadlen;
 
   ents[0] = (nghttp3_settings_entry){