[PATCH] drm: Fix issue reported by Coverity in drivers/char/drm/via_irq.c

This patch tries to fix an issue reported in drivers/char/drm/via_irq.c by
Coverity, please review and apply if correct.

Error reported:
CID: 3444 Checker: REVERSE_INULL (help)
File: /export2/p4-coverity/mc2/linux26/drivers/char/drm/via_irq.c
Function: via_driver_irq_wait
Description: Pointer "dev_priv" dereferenced before NULL check

Patch Description:
 Move de-referencing dev_priv to after the NULL check.

Signed-off-by: Jayachandran C. <c.jayachandran at gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/via_irq.c

@@ -198,7 +198,7 @@ via_driver_irq_wait(drm_device_t * dev, unsigned int irq, int force_sequence,
 	unsigned int cur_irq_sequence;
 	drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 	int ret = 0;
-	maskarray_t *masks = dev_priv->irq_masks;
+	maskarray_t *masks;
 	int real_irq;
 
 	DRM_DEBUG("%s\n", __FUNCTION__);
@@ -222,6 +222,7 @@ via_driver_irq_wait(drm_device_t * dev, unsigned int irq, int force_sequence,
 		return DRM_ERR(EINVAL);
 	}
 
+	masks = dev_priv->irq_masks;
 	cur_irq += real_irq;
 
 	if (masks[real_irq][2] && !force_sequence) {