Fix bcc length for printing

[ Merge of http://go/wvgerrit/194310 ]

Resize bcc to the correct length to eliminate the trailing zeros.

Bug: 330645490
Test: core unit tests

Change-Id: I56b6d30120735a4d7a0f39f29a9f255bd2d2d18c

libwvdrmengine/cdm/core/test/provisioning_holder.cpp

@@ -185,6 +185,7 @@ std::string ProvisioningHolder::DumpProvAttempt(const std::string& request,
     if (result != OEMCrypto_SUCCESS) {
       info << "--- ERROR GETTING BCC. result=" << result;
     } else {
+      bcc.resize(bcc_length);
       info << "BCC = (len=" << bcc_length << ") "
            << wvutil::unlimited_b2a_hex(bcc) << "\n"
            << "Additional Sig = (len=" << signature_length << ") "