xfs: use kvfree() in xfs_ioc_attr_list()

Wrongly converted from kmem_free() to kfree().
Reported-by: Matthew Wilcox <willy@infradead.org>
Fixes: 49292576 ("xfs: convert kmem_free() for kvmalloc users to kvfree()")
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/xfs_ioctl.c

@@ -435,7 +435,7 @@ xfs_ioc_attr_list(
 	    copy_to_user(ucursor, &context.cursor, sizeof(context.cursor)))
 		error = -EFAULT;
 out_free:
-	kfree(buffer);
+	kvfree(buffer);
 	return error;
 }