[nginx] Variables: use ngx_http_variable_null_value where appropriate.

[Ruslan Ermilov]

details:   http://hg.nginx.org/nginx/rev/7f480434c7f2
branches:  
changeset: 7053:7f480434c7f2
user:      Ruslan Ermilov <ru at nginx.com>
date:      Fri Jul 07 14:34:21 2017 +0300
description:
Variables: use ngx_http_variable_null_value where appropriate.

diffstat:

 src/http/ngx_http_variables.c |  16 +++++-----------
 1 files changed, 5 insertions(+), 11 deletions(-)

diffs (38 lines):

diff -r 70e65bf8dfd7 -r 7f480434c7f2 src/http/ngx_http_variables.c
--- a/src/http/ngx_http_variables.c	Tue Jul 04 18:50:41 2017 +0300
+++ b/src/http/ngx_http_variables.c	Fri Jul 07 14:34:21 2017 +0300
@@ -1463,17 +1463,15 @@ static ngx_int_t
 ngx_http_variable_is_args(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data)
 {
-    v->valid = 1;
-    v->no_cacheable = 0;
-    v->not_found = 0;
-
     if (r->args.len == 0) {
-        v->len = 0;
-        v->data = NULL;
+        *v = ngx_http_variable_null_value;
         return NGX_OK;
     }
 
     v->len = 1;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
     v->data = (u_char *) "?";
 
     return NGX_OK;
@@ -1990,11 +1988,7 @@ ngx_http_variable_request_completion(ngx
         return NGX_OK;
     }
 
-    v->len = 0;
-    v->valid = 1;
-    v->no_cacheable = 0;
-    v->not_found = 0;
-    v->data = (u_char *) "";
+    *v = ngx_http_variable_null_value;
 
     return NGX_OK;
 }