common: xdrfd must fsync only if we're sending bytes (XDR_ENCODE)
common: xdrfd must fsync only if we're sending bytes (XDR_ENCODE)

Signed-off-by: Josef 'Jeff' Sipek <a620f141433c70aa9e43778305a6c68cbfadfb25@josefsipek.net>

jeffpc/nx01