drivers/spi/tpm: de-assert chip select on transaction error

In the case of start_transaction() failing the chip select is never
deasserted. Correct that by deasserting the chip select when
start_transaction() fails.

BUG=b:36598499

Change-Id: I2c5200085eb357259edab39c1a0fa7b1d81ba7b2
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/19056
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
1 file changed