nfsd4: fix v4 state shutdown error paths
If someone tries to shut down the laundry_wq while it isn't up it'll
cause an oops.
This can happen because write_ports can create a nfsd_svc before we
really start the nfs server, and we may fail before the server is ever
started.
Also make sure state is shutdown on error paths in nfsd_svc().
Use a common global nfsd_up flag instead of nfs4_init, and create common
helper functions for nfsd start/shutdown, as there will be other work
that we want done only when we the number of nfsd threads transitions
between zero and nonzero.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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