long user-agent bugfix

src/http/modules/ngx_http_browser_module.c

diff --git a/src/http/modules/ngx_http_browser_module.c b/src/http/modules/ngx_http_browser_module.c
index 0c63780..c396167 100644
--- a/src/http/modules/ngx_http_browser_module.c
+++ b/src/http/modules/ngx_http_browser_module.c
@@ -244,7 +244,7 @@
         name += browsers[i].add;
 
         if (name >= last) {
-            *v = ngx_http_variable_null_value;
+            continue;
         }
 
         ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,