Error handling in nfsd

[joyul_juniper.net]

Summary

Synchronize the error handling in nfsd. If you check other error handlings in those same condition blocks, it uses nfsd_exit instead, which will call killchildren() and call the rpcbind service to do the service un-mapping.

Test Plan

Have the device run the sanity test.

[rmacklem]

Looks ok to me.

I will commit it in a couple of weeks, unless the
reporter requests otherwise.