When tpm2_submit_command_real() is called for a retry, the content of
out buffer can already be set with previous tpm2_submit_command_real()
call's reply. Add a call to grub_tpm2_buffer_init() before tpm2_submit_command_real().
This solves the issues occurring during TPM_CC_Load command on the
integrated TPM 2.0 in Intel Elkhart Lake chip.
Signed-off-by: Yann Diorcet <diorcet.yann@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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