Widen amount-to-flush arguments of FileWriteback and callers.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 95ef43c4308102d23afa887c9fc28d9977612a2d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-04-13T22:12:06Z
Releases: 9.6.0
Widen amount-to-flush arguments of FileWriteback and callers.

It's silly to define these counts as narrower than they might someday
need to be.  Also, I believe that the BLCKSZ * nflush calculation in
mdwriteback was capable of overflowing an int.

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