tpm xen: Remove bogus tpm_chip_unregister

commit 1f0f30e404b3d8f4597a2d9b77fba55452f8fd0e upstream.

tpm_chip_unregister can only be called after tpm_chip_register.
devm manages the allocation so no unwind is needed here.

Fixes: afb5abc ("tpm: two-phase chip management functions")
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jgunthorpe

drivers/char/tpm/xen-tpmfront.c

@@ -305,7 +305,6 @@ static int tpmfront_probe(struct xenbus_device *dev,
 	rv = setup_ring(dev, priv);
 	if (rv) {
 		chip = dev_get_drvdata(&dev->dev);
-		tpm_chip_unregister(chip);
 		ring_free(priv);
 		return rv;
 	}