drm/msm/dsi: dsi_phy_28nm_8960: fix uninitialized variable access

The parent_name initialization was lost in refactoring, restore it now.

Fixes: 5d13459 ("drm/msm/dsi: push provided clocks handling into a generic code")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Link: https://lore.kernel.org/r/20210410011901.1735866-1-dmitry.baryshkov@linaro.org
Signed-off-by: Rob Clark <robdclark@chromium.org>

Author: lumag

drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c

@@ -405,6 +405,10 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **prov
 	if (!vco_name)
 		return -ENOMEM;
 
+	parent_name = devm_kzalloc(dev, 32, GFP_KERNEL);
+	if (!parent_name)
+		return -ENOMEM;
+
 	clk_name = devm_kzalloc(dev, 32, GFP_KERNEL);
 	if (!clk_name)
 		return -ENOMEM;