drm/meson: dw-hdmi: Fix devm_regulator_*get_enable*() conversion

drm/meson: dw-hdmi: Fix devm_regulator_*get_enable*() conversion

devm_regulator_get_enable_optional() function returns 0 on success, so
use it for the check if function succeeded instead of the -ENODEV value.

Fixes: 429e87063661 ("drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
[narmstrong: s/succeeded/succeeded/ in commit message]
Link: https://patchwork.freedesktop.org/patch/msgid/20230109220033.31202-1-m.szyprowski@samsung.com