nbd: Fix hung when signal interrupts nbdstartdevice_ioctl()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.14.296 by commit 3ba3846cb3e2fb3c6fbf79e998472821b298419e. For more details please see the references link.