Tolerate '\0' in URI when mapping URI to path.

If a rewritten URI has the null character, only a part of URI was
copied to a memory buffer allocated for path.  In some setups this
could be exploited to expose uninitialized memory via the Location
header.

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index aa03fd6..a603e09 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1843,7 +1843,8 @@
         }
     }
 
-    last = ngx_cpystrn(last, r->uri.data + alias, r->uri.len - alias + 1);
+    last = ngx_copy(last, r->uri.data + alias, r->uri.len - alias);
+    *last = '\0';
 
     return last;
 }