ssl_tls: fix format warning in ssl_parse_certificate() on x86_64
ssl_tls: fix format warning in ssl_parse_certificate() on x86_64

Fix warning "format '%d' expects type 'int', but argument 2 has type
'long unsigned int'" in ssl_parse_certificate() on x86_64.

appunite/tropicssl,theatrus/tropicssl,theatrus/tropicssl,appunite/tropicssl