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tpm2: Do not call EVP_PKEY_CTX_set0_rsa_oaep_label() for label of size 0 (OSSL 3)

Openssl 3.0 did return an error if EVP_PKEY_CTX_set0_rsa_oaep_label was called
with label size 0. The function should only be called if the size of the label
is greater 0.
With this fix TPM2_RSA_Encrypt/Decrypt did work with OpenSSL 1.1 and 3.0
for encryption without label.

Signed-off-by: Juergen Repp <juergen.repp@sit.fraunhofer.de>

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