close fd if we're a directory in filemap.

src/filemap.c

@@ -280,6 +280,7 @@ lookup:
 				fd = -1;
 			}
 		} else if (S_ISDIR(st.st_mode) && index == 0) {
+			close(fd);
 			if (req->path[strlen(req->path) - 1] != '/') {
 				(void)snprintf(fpath,
 				    sizeof(fpath), "%s/", req->path);