[mod_accesslog] don't close fd -1

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2956 152afb58-edef-0310-8abb-c4023f1b3aa9

src/mod_accesslog.c

@@ -603,7 +603,7 @@ SIGHUP_FUNC(log_access_cycle) {
 		    s->access_logfile->used > 1 &&
 		    s->access_logfile->ptr[0] != '|') {
 
-			close(s->log_access_fd);
+			if (-1 != s->log_access_fd) close(s->log_access_fd);
 
 			if (-1 == (s->log_access_fd =
 				   open(s->access_logfile->ptr, O_APPEND | O_WRONLY | O_CREAT | O_LARGEFILE, 0644))) {