virtio: console: Fix crash when hot-unplugging a port and read is blocked
When removing a port we don't check if a program was blocked for read. This leads to a crash when SIGTERM is sent to the program after hot-unplugging the port. Signed-off-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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