[core] setrlimit max-fds <= rlim_max for non-root (fixes #2723)

x-ref:
  "setrlimit can increase RLIMIT_NOFILE up to rlim_max for non-root"
  https://redmine.lighttpd.net/issues/2723

NEWS

@@ -73,6 +73,7 @@ NEWS
   * [mod_status] table w/ count of con states (fixes #2427)
   * [mod_dirlisting] class for dir <tr> (fixes #2304)
   * [core] define __STDC_WANT_LIB_EXT1__ (fixes #2722)
+  * [core] setrlimit max-fds <= rlim_max for non-root (fixes #2723)
 
 - 1.4.39 - 2016-01-02
   * [core] fix memset_s call (fixes #2698)

src/server.c

@@ -954,9 +954,9 @@ int main (int argc, char **argv) {
 		}
 
 		/**
-		 * we are not root can can't increase the fd-limit, but we can reduce it
+		 * we are not root can can't increase the fd-limit above rlim_max, but we can reduce it
 		 */
-		if (srv->srvconf.max_fds && srv->srvconf.max_fds < rlim.rlim_cur) {
+		if (srv->srvconf.max_fds && srv->srvconf.max_fds <= rlim.rlim_max) {
 			/* set rlimits */
 
 			rlim.rlim_cur = srv->srvconf.max_fds;