fsverity fixup

After freeing i_verity_info, it's necessary to set it NULL since the
the inode structure doesn't get cleared when it gets allocated.
That's why it's up to functions like inode_init_always() to reset
various fields to be zero.  F or i_verity_info, we should do that in
fsverity_cleanup_inode().

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/verity/setup.c b/fs/verity/setup.c
index 4a3ac5d..6c8664d 100644
--- a/fs/verity/setup.c
+++ b/fs/verity/setup.c
@@ -1023,6 +1023,7 @@ EXPORT_SYMBOL_GPL(fsverity_prepare_getattr);
 void fsverity_cleanup_inode(struct inode *inode)
 {
 	free_fsverity_info(inode->i_verity_info);
+	inode->i_verity_info = NULL;
 }
 EXPORT_SYMBOL_GPL(fsverity_cleanup_inode);