hwspin_lock_register_single() always returns 0 despite checking the result from radix_tree_insert(). Propagate the errno to make sanity checks in callers of this function actually meaningful. Fixes: 300bab9770e2 ("hwspinlock/core: register a bank of hwspinlocks in a single API call") Link: https://sashiko.dev/#/patchset/20260319105947.6237-1-wsa%2Brenesas%40sang-engineering.com # review of patch 14 Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20260512084856.30497-2-wsa+renesas@sang-engineering.com Signed-off-by: Bjorn Andersson <andersson@kernel.org>