regulator: tps80031: remove redundant assignment to variables ret and val

The variables ret and val are being initialized with values that are
never read and are being updated later with a new value.  The
initializations are redundant and can be removed.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Addresses-Coverity: ("Unused value")
Link: https://lore.kernel.org/r/20200410133406.24458-1-colin.king@canonical.com


Signed-off-by: Mark Brown <broonie@kernel.org>