journal: fix log message

Author: yuwata

src/journal/journald-stream.c

@@ -825,7 +825,7 @@ int server_restore_streams(Server *s, FDSet *fds) {
                         /* No file descriptor? Then let's delete the state file */
                         log_debug("Cannot restore stream file %s", de->d_name);
                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
-                                log_warning_errno(errno, "Failed to remove %s%s: %m", path, de->d_name);
+                                log_warning_errno(errno, "Failed to remove %s/%s: %m", path, de->d_name);
                         continue;
                 }