speed.c: use size_t instead of int to match function signatures
speed.c: use size_t instead of int to match function signatures

Signed-off-by: Cristian Stoica <cristian.stoica@nxp.com>

Reviewed-by: Emilia Käsper <6521fc25e7624eef7c3a0d89b71de7e612d27d37@openssl.org>
Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1378)
openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl