drm/exynos: dsi: propagate error value and silence meaningless warning

[ Upstream commit 0a9d1e3f3f038785ebc72d53f1c409d07f6b4ff5 ]

Properly propagate error value from devm_regulator_bulk_get() and don't
confuse user with meaningless warning about failure in getting regulators
in case of deferred probe.
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: NKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: NInki Dae <inki.dae@samsung.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/gpu/drm/exynos/exynos_drm_dsi.c

@@ -1722,8 +1722,9 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dsi->supplies),
 				      dsi->supplies);
 	if (ret) {
+		if (ret != -EPROBE_DEFER)
 			dev_info(dev, "failed to get regulators: %d\n", ret);
-		return -EPROBE_DEFER;
+		return ret;
 	}
 
 	dsi->clks = devm_kcalloc(dev,