Fix base64 encoding in tpm2_getmanufec
Fix base64 encoding in tpm2_getmanufec

Fixes #60
01org/tpm2.0-tools,01org/tpm2.0-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools