usb: phy: tegra: Perform general clean up of the code

usb: phy: tegra: Perform general clean up of the code

This patch fixes few dozens of legit checkpatch warnings, adds missed
handling of potential error-cases and prettifies code where makes sense.
All these clean-up changes are quite minor and do not fix any real
problems.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-7-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>