Regression! kern/t_pty fails - cannot set pty's queue size

[Paul Goyette <paul%whooppee.com@localhost>]

Some time between 10:20:07 and 15:50:06 UTC on 2012-08-12, the pty_queue 
test case for kern/t_pty has been failing.  The error appears to be an 
EBUSY return from "ioctl(fd, TIOCSQSIZE, &opt)".  This worked correctly 
in prior test runs, but has been failing consistently since Aug 12.

This would appear to be a result of the following commit:

        Module Name:    src
        Committed By:   christos
        Date:           Sun Aug 12 14:45:45 UTC 2012

        Modified Files:
                src/sys/kern: tty.c

        Log Message:
        PR/46780: Dennis Ferguson: Take the easy way out and return EBUSY
        when changing the queue size if the output queue is not empty.
        Other solutions seemed too complex/fragile.

Perhaps the "output queue not empty" check isn't working?



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