HTTP/2: send SETTINGS ACK after applying all SETTINGS params.

This avoids sending unnecessary SETTINGS ACK in case of PROTOCOL_ERROR.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

src/http/v2/ngx_http_v2.c

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index 0a0dcd7..be78509 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -1959,8 +1959,6 @@
         return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_SIZE_ERROR);
     }
 
-    ngx_http_v2_send_settings(h2c, 1);
-
     return ngx_http_v2_state_settings_params(h2c, pos, end);
 }
 
@@ -2026,6 +2024,8 @@
         pos += NGX_HTTP_V2_SETTINGS_PARAM_SIZE;
     }
 
+    ngx_http_v2_send_settings(h2c, 1);
+
     if (window_delta) {
         if (ngx_http_v2_adjust_windows(h2c, window_delta) != NGX_OK) {
             return ngx_http_v2_connection_error(h2c,