delete unneeded dXSTARG

src/http/modules/perl/nginx.xs

diff --git a/src/http/modules/perl/nginx.xs b/src/http/modules/perl/nginx.xs
index c665446..f3948e2 100644
--- a/src/http/modules/perl/nginx.xs
+++ b/src/http/modules/perl/nginx.xs
@@ -933,7 +933,6 @@
 sleep(r, sleep, next)
     CODE:
 
-    dXSTARG;
     ngx_http_request_t   *r;
     ngx_http_perl_ctx_t  *ctx;