NFS: Get rid of nfs_restart_rpc()

It can trivially be replaced with rpc_restart_call_prepare.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --cc fs/nfs/internal.h
Simple merge

diff --cc fs/nfs/nfs4filelayout.c
Simple merge

diff --cc fs/nfs/nfs4proc.c
Simple merge

diff --cc fs/nfs/read.c
Simple merge

diff --cc fs/nfs/unlink.c
Simple merge

diff --cc fs/nfs/write.c
Simple merge

diff --cc net/sunrpc/clnt.c
Simple merge