Fix second error from Coverity-161057

Fix second error from Coverity-161057

Coverity flagged a second error in this code

we're comparing block_padding and hs_padding for >= 0, which is always
true

With the change to the use of strtoul, inputs that are preceded with a -
(i.e. negative values), are caught already, so the check is redundant

just remove the check entirely

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from https://github.com/openssl/openssl/pull/24993)