tpm: vtpm_proxy: Suppress error logging when in closed state

Suppress the error logging when the core TPM driver sends commands
to the VTPM proxy driver and -EPIPE is returned in case the VTPM
proxy driver is 'closed' (closed anonymous file descriptor).  This
error code is only returned by the send function and by tpm_transmit
when the VTPM proxy driver is being used.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index be54159..a965a9f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -429,8 +429,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
 
 	rc = chip->ops->send(chip, (u8 *) buf, count);
 	if (rc < 0) {
-		dev_err(&chip->dev,
-			"tpm_transmit: tpm_send: error %d\n", rc);
+		if (rc != -EPIPE)
+			dev_err(&chip->dev,
+				"%s: tpm_send: error %d\n", __func__, rc);
 		goto out;
 	}