MFC: r264842
Modify the NFSv4 client's Pathconf RPC (actually a Getattr Op.)
so that it only does the RPC for names that are answered by the RPC.
Doing the RPC for other names is harmless, but unnecessary.
MFC: r264845
Remove an unnecessary level of indirection for an argument.
This simplifies the code and should avoid the clang sparc
port from generating an abort() call.