bna: Remove error checking for debugfs create APIs

Driver bna can work fine even if any previous call to debugfs create
APIs failed. All return value checks of them should be dropped, as
debugfs APIs say.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241028020943.507-2-thunder.leizhen@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>