media: davinci/vpfe_capture.c: Avoid BUG_ON for register failure

In vpfe_register_ccdc_device(), failure to allocate dev->hw_ops
fields calls BUG_ON(). This patch returns the error to callers
instead of crashing. The issue was identified by a static
analysis tool, written by us.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/davinci/vpfe_capture.c

@@ -168,21 +168,22 @@ int vpfe_register_ccdc_device(const struct ccdc_hw_device *dev)
 	int ret = 0;
 	printk(KERN_NOTICE "vpfe_register_ccdc_device: %s\n", dev->name);
 
-	BUG_ON(!dev->hw_ops.open);
-	BUG_ON(!dev->hw_ops.enable);
-	BUG_ON(!dev->hw_ops.set_hw_if_params);
-	BUG_ON(!dev->hw_ops.configure);
-	BUG_ON(!dev->hw_ops.set_buftype);
-	BUG_ON(!dev->hw_ops.get_buftype);
-	BUG_ON(!dev->hw_ops.enum_pix);
-	BUG_ON(!dev->hw_ops.set_frame_format);
-	BUG_ON(!dev->hw_ops.get_frame_format);
-	BUG_ON(!dev->hw_ops.get_pixel_format);
-	BUG_ON(!dev->hw_ops.set_pixel_format);
-	BUG_ON(!dev->hw_ops.set_image_window);
-	BUG_ON(!dev->hw_ops.get_image_window);
-	BUG_ON(!dev->hw_ops.get_line_length);
-	BUG_ON(!dev->hw_ops.getfid);
+	if (!dev->hw_ops.open ||
+	    !dev->hw_ops.enable ||
+	    !dev->hw_ops.set_hw_if_params ||
+	    !dev->hw_ops.configure ||
+	    !dev->hw_ops.set_buftype ||
+	    !dev->hw_ops.get_buftype ||
+	    !dev->hw_ops.enum_pix ||
+	    !dev->hw_ops.set_frame_format ||
+	    !dev->hw_ops.get_frame_format ||
+	    !dev->hw_ops.get_pixel_format ||
+	    !dev->hw_ops.set_pixel_format ||
+	    !dev->hw_ops.set_image_window ||
+	    !dev->hw_ops.get_image_window ||
+	    !dev->hw_ops.get_line_length ||
+	    !dev->hw_ops.getfid)
+		return -EINVAL;
 
 	mutex_lock(&ccdc_lock);
 	if (!ccdc_cfg) {