Restate fragment readahead.
Restate fragment readahead.

Revert special case behavior of set_input_fragment, except that
of passing the supplied maxreadahead to get_input_bytes, which
now takes the maxreadahead parameter in turn.  Finally, carry
maxreadahead on to fill_input_buf, and use it as the max read
length if greater than len.

Signed-off-by: Matt Benjamin <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@linuxbox.com>

sswen/ntirpc,sswen/ntirpc