net: qrtr: free memory on error path in radix_tree_insert()

Function radix_tree_insert() returns errors if the node hasn't
been initialized and added to the tree.

"kfree(node)" and return value "NULL" of node_get() help
to avoid using unclear node in other calls.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Cc: <[e-mail]> # 5.7
Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
Signed-off-by: Natalia Petrova <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Manivannan Sadhasivam <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/qrtr/ns.c

···
 
 	node->id = node_id;
 
-	radix_tree_insert(&nodes, node_id, node);
+	if (radix_tree_insert(&nodes, node_id, node)) {
+		kfree(node);
+		return NULL;
+	}
 
 	return node;
 }