soc/nvidia/tegra210: Fix potential NULL pointer dereference

Recent Coverity scan indicated potential NULL deference; if either
spi->dma_in or spi->dma_out are NULL, the fifo_error() check could
dereference a NULL pointer.

Also fixed what appears to be a logic bug for the spi->dma_out case,
where it was using the todo (count) from spi->dma_in.

Found-by: Coverity CID 1241838, 1241854
Change-Id: Icd1412f0956c0a4a75266d1873d5e9848aceee32
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34787
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions