fapi: use ECDSA_verify vs ECDSA_do_verify
fapi: use ECDSA_verify vs ECDSA_do_verify

ECDSA_verify() internally performs the d2i conversion, so just call it
rather than doing the d2i conversion and calling ECDSA_do_verify. This
will avoid having to perform the cleanup on the ECDSA_SIG pointer.

Signed-off-by: William Roberts <60148e894dabf0b83bde1d460768794cd453c455@intel.com>

01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,01org/tpm2-tss,01org/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/TPM2.0-TSS