rpc_create_*_dir: don't bother with qstr

just pass the name

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc include/linux/sunrpc/rpc_pipe_fs.h
Simple merge

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

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

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