netfilter: nft_socket: Fix a NULL vs IS_ERR() bug in nft_socket_cgroup_subtree_level()

The cgroup_get_from_path() function never returns NULL, it returns error
pointers.  Update the error handling to match.

Fixes: 7f3287d ("netfilter: nft_socket: make cgroupsv2 matching work with namespaces")
Signed-off-by: Dan Carpenter <[email protected]>
Acked-by: Florian Westphal <[email protected]>
Acked-by: Pablo Neira Ayuso <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Dan Carpenter

net/netfilter/nft_socket.c

@@ -61,8 +61,8 @@ static noinline int nft_socket_cgroup_subtree_level(void)
 	struct cgroup *cgrp = cgroup_get_from_path("/");
 	int level;
 
-	if (!cgrp)
-		return -ENOENT;
+	if (IS_ERR(cgrp))
+		return PTR_ERR(cgrp);
 
 	level = cgrp->level;