[patch] VFS: collect_mounts() should return an ERR_PTR

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

This should actually be returning an ERR_PTR on error instead of NULL.
That was how it was designed and all the callers expect it.

Cc: <stable@xxxxxxxxxxxxxxx> # 3.10+
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/fs/namespace.c b/fs/namespace.c
index 9809084..f1c61bb 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1429,7 +1429,7 @@ struct vfsmount *collect_mounts(struct path *path)
 			 CL_COPY_ALL | CL_PRIVATE);
 	namespace_unlock();
 	if (IS_ERR(tree))
-		return NULL;
+		return ERR_CAST(tree);
 	return &tree->mnt;
 }
 
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