spi: tegra114: Remove unnecessary NULL-pointer checks

spi: tegra114: Remove unnecessary NULL-pointer checks

[ Upstream commit 373c36bf7914e3198ac2654dede499f340c52950 ]

cs_setup, cs_hold and cs_inactive points to fields of spi_device struct,
so there is no sense in checking them for NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 04e6bb0d6bb1 ("spi: modify set_cs_timing parameter")
Signed-off-by: Alexander Danilenko <al.b.danilenko@gmail.com>
Link: https://lore.kernel.org/r/20230815092058.4083-1-al.b.danilenko@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Stable-dep-of: 4426e6b4ecf6 ("spi: tegra114: Don't fail set_cs_timing when delays are zero")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>