drm: logicvc: Fix uninitialized variable in probe

The "regmap" is supposed to be initialized to NULL but it's used
without being initialized.

Fixes: efeeaefe ("drm: Add support for the LogiCVC display controller")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/Yqh6OfSiPFuVrGo4@kili

drivers/gpu/drm/logicvc/logicvc_drm.c

@@ -298,7 +298,7 @@ static int logicvc_drm_probe(struct platform_device *pdev)
 	struct logicvc_drm *logicvc;
 	struct device *dev = &pdev->dev;
 	struct drm_device *drm_dev;
-	struct regmap *regmap;
+	struct regmap *regmap = NULL;
 	struct resource res;
 	void __iomem *base;
 	int irq;