Clear residuals for XPT_TARGET_IO/XPT_CONT_TARGET_IO calls just
as we do for XPT_SCSI_IO calls.
Make xpt_release_devq a proper reciprocal of xpt_freeze_devq by
allowing the caller to decrement the count more than once per call.
Change the semantics of xpt_path_cmp to return 1 for a match
with a wildcard from path1 and 2 for a match with wildcards
from path2. This change doesn't affect most callers as they
only check for >=0 (exact match or one containing a wildcard).
When cleaning up a device node, ensure that there are no timeouts
outstanding that reference it.
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