prevent null character in error log

[Filimonov Vadim]

# HG changeset patch
# User Vadim Filimonov <fffilimonov at yandex.ru>
# Date 1519656740 -7200
#      Mon Feb 26 16:52:20 2018 +0200
# Node ID 00de93c2804c0679adc33dee25cb948e61c04c05
# Parent  8b70d4caa505656bb5ee3f95246c4f39b62354ef
prevent null character in error log
https://trac.nginx.org/nginx/ticket/1494

diff -r 8b70d4caa505 -r 00de93c2804c src/http/modules/ngx_http_auth_basic_module.c
--- a/src/http/modules/ngx_http_auth_basic_module.c     Thu Feb 22 13:16:21 2018 +0300
+++ b/src/http/modules/ngx_http_auth_basic_module.c     Mon Feb 26 16:52:20 2018 +0200
@@ -266,8 +266,8 @@
     }

     ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
-                  "user \"%V\" was not found in \"%V\"",
-                  &r->headers_in.user, &user_file);
+                  "user \"%V\" was not found in \"%s\"",
+                  &r->headers_in.user, user_file.data);

     return ngx_http_auth_basic_set_realm(r, &realm);
 }