in wdctimeout() ignore timeout if not actually waiting for IRQ, to avoid
processing xfer which is not quite setup

in wdcintr() actually write the error message on invocation when
not waiting for IRQ even without ATADEBUG option, as usually that
is a driver bug; might revisit this if this ends up too noisy for
PCI-IDE which seems to ignore WDCTL_IDS and hence trigger irq even
for polled commands

(jdolecek)