[nginx] Configure: fix build with -Werror=nonnull.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/0bf08d9c82c1
branches:  
changeset: 6623:0bf08d9c82c1
user:      Piotr Sikora <piotrsikora at google.com>
date:      Mon Jun 27 15:00:04 2016 -0700
description:
Configure: fix build with -Werror=nonnull.

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

diffstat:

 auto/unix |  2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diffs (12 lines):

diff --git a/auto/unix b/auto/unix
--- a/auto/unix
+++ b/auto/unix
@@ -261,7 +261,7 @@ ngx_feature_run=no
 ngx_feature_incs="#include <dlfcn.h>"
 ngx_feature_path=
 ngx_feature_libs=
-ngx_feature_test="dlopen(NULL, RTLD_NOW | RTLD_GLOBAL); dlsym(NULL, NULL)"
+ngx_feature_test="dlopen(NULL, RTLD_NOW | RTLD_GLOBAL); dlsym(NULL, \"\")"
 . auto/feature