devlink: fix memory leak on 'resource'

Currently, if the call to devlink_resource_find returns null then
the error exit path does not free the devlink_resource 'resource'
and a memory leak occurs. Fix this by kfree'ing resource on the
error exit path.

Detected by CoverityScan, CID#1464184 ("Resource leak")

Fixes: d9f9b9a ("devlink: Add support for resource abstraction")
Signed-off-by: Colin Ian King <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Colin Ian King

net/core/devlink.c

@@ -3182,6 +3182,7 @@ int devlink_resource_register(struct devlink *devlink,
 			resource_list = &parent_resource->resource_list;
 			resource->parent = parent_resource;
 		} else {
+			kfree(resource);
 			err = -EINVAL;
 			goto out;
 		}