virsh: fix previous patch

The last patch breaks make check for two reasons. First, it reverses the
condition but leaves default level unchanged, so instead of not printing
anything but errors before the patch it now prints all debug messages by
default. Second, you forgot to change -d5 option passed to virsh in
tests/virsh-optparse to -d0; the script wants to see all debug messages.

tests/virsh-optparse

@@ -64,7 +64,7 @@ for args in \
     '--count 2 test' \
     '--count=2 test' \
 ; do
-  virsh -d5 -c $test_url setvcpus $args >out 2>>err || fail=1
+  virsh -d0 -c $test_url setvcpus $args >out 2>>err || fail=1
   LC_ALL=C sort out | compare - exp-out || fail=1
 done
 test -s err && fail=1