drivers/fpga/dfl-afu-dma-region.c: get rid of pointless access_ok()

Address is passed to get_user_pages_fast(), which does access_ok().
NB: this is called only from ->ioctl(), and only under USER_DS.

Signed-off-by: Al Viro <[email protected]>

Author: Al Viro

drivers/fpga/dfl-afu-dma-region.c

@@ -324,10 +324,6 @@ int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
 	if (user_addr + length < user_addr)
 		return -EINVAL;
 
-	if (!access_ok((void __user *)(unsigned long)user_addr,
-		       length))
-		return -EINVAL;
-
 	region = kzalloc(sizeof(*region), GFP_KERNEL);
 	if (!region)
 		return -ENOMEM;