drm/auth: remove redundant assignment to variable ret

The variable ret is being initialized with a value that is
never read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200524222715.27305-1-colin.king@canonical.com

drivers/gpu/drm/drm_auth.c

@@ -282,7 +282,7 @@ static void drm_drop_master(struct drm_device *dev,
 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
-	int ret = -EINVAL;
+	int ret;
 
 	mutex_lock(&dev->master_mutex);