[PATCH] erofs-utils: mkfs: fix crash when failing to build tree

[Gao Xiang]

For example: It crashes instead of cleanly erroring out if there's
a file for which it doesn't have permissions to read (e.g. /etc/gshadow
has mode 000).

Reported-by: Jonathan Lebon <jonat...@jlebon.com>
Fixes: 6a8e395ae4fd ("erofs-utils: fix up root inode for incremental builds")
Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
 mkfs/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mkfs/main.c b/mkfs/main.c
index 2988c65..624b191 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -1450,6 +1450,7 @@ int main(int argc, char **argv)
                root = erofs_mkfs_build_tree_from_path(&g_sbi, cfg.c_src_path);
                if (IS_ERR(root)) {
                        err = PTR_ERR(root);
+                       root = NULL;
                        goto exit;
                }
        }
-- 
2.43.5