Coverity: clean_tree(): Error handling issues

[coverity-bot <keescook@chromium.org>]

Hello!

This is an experimental automated report about issues detected by Coverity
from a scan of next-20191108 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by recent commits:

800350a3f145 ("net/mlx5: Avoid NULL pointer dereference on steering cleanup")

Coverity reported the following:

*** CID 1487837:  Error handling issues  (CHECKED_RETURN)
/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c: 2479 in clean_tree()
2473     static void clean_tree(struct fs_node *node)
2474     {
2475     	if (node) {
2476     		struct fs_node *iter;
2477     		struct fs_node *temp;
2478
vvv     CID 1487837:  Error handling issues  (CHECKED_RETURN)
vvv     Calling "tree_get_node" without checking return value (as is done elsewhere 5 out of 6 times).
2479     		tree_get_node(node);
2480     		list_for_each_entry_safe(iter, temp, &node->children, list)
2481     			clean_tree(iter);
2482     		tree_put_node(node, false);
2483     		tree_remove_node(node, false);
2484     	}

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487837 ("Error handling issues")
Fixes: 800350a3f145 ("net/mlx5: Avoid NULL pointer dereference on steering cleanup")


Thanks for your attention!

-- 
Coverity-bot