repo/linux/axboe-block: set private_report_branch

Re: [axboe-block:nvme-passthru-wip 10/19] drivers/nvme/host/ioctl.c:47:19: error: cast to pointer from integer of different size
---------------
There's a reason the branch is called -wip, it's just a hodge podge of
stuff. Not sure why the kernel test robot bothers reporting failures
publicly for that...

--
Jens Axboe
---------------

Signed-off-by: Chen Rong <rong.a.chen@intel.com>
Signed-off-by: Philip Li <philip.li@intel.com>

repo/linux/axboe-block

@@ -14,4 +14,5 @@ subsystems:
 - scsi
 - blkcg
 - nbd
-notify_build_success_branch: .*
+notify_build_success_branch: .*
+private_report_branch: .*-wip