tpm: Only call pm_runtime_get_sync if device has a parent
Only call pm_runtime_get_sync if the device has a parent. This change fixes a crash in the tpm_vtpm_proxy driver since that driver does not have a parent device. Signed-off-by:Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by:
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by:
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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