coverity: #1427191

src/lxc/conf.c

@@ -2411,6 +2411,7 @@ int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf,
 			return -1;
 		}
 
+		if (fd >= 0) {
 			buflen = sizeof("deny\n") - 1;
 			errno = 0;
 			ret = lxc_write_nointr(fd, "deny\n", buflen);
@@ -2421,6 +2422,7 @@ int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf,
 			}
 			close(fd);
 		}
+	}
 
 	ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid,
 		       idtype == ID_TYPE_UID ? 'u' : 'g');