regulator: max8973: Fix up ramp_delay for MAX8973_RAMP_25mV_PER_US case

Fix trivial typo.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed