disp: msm: fix out-of-bound access and NULL dereference

Fix possible out-of-bound access and NULL pointer
dereference in SDE and PLL driver.

Change-Id: Ic5c34b3b4c3e983413a0351c38206cf3f3ab3b1f
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

pll/pll_drv.c

@@ -208,9 +208,12 @@ static inline int mdss_pll_get_ioresurces(struct platform_device *pdev,
 	struct resource *rsc = platform_get_resource_byname(pdev,
 						IORESOURCE_MEM, resource_name);
 	if (rsc) {
+		if (!regmap)
+			return -ENOMEM;
+
 		*regmap = devm_ioremap(&pdev->dev,
 					rsc->start, resource_size(rsc));
-		if (!regmap)
+		if (!*regmap)
 			return -ENOMEM;
 	}
 	return rc;