tpm: Improve help on TPM types when none are available
Help is a bit awkward when no TPM types are built into QEMU: $ qemu-system-x86_64 -tpmdev nonexistent,id=tpm0 qemu-system-x86_64: -tpmdev nonexistent,id=tpm0: Parameter 'type' expects a TPM backend type Supported TPM types (choose only one): Improve to qemu-system-x86_64: -tpmdev nonexistent,id=tpm0: Parameter 'type' expects a TPM backend type No TPM backend types are available Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: NStefan Berger <stefanb@linux.ibm.com> Signed-off-by: NStefan Berger <stefanb@linux.ibm.com>
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