From 848b3182365fdf5a05bcd5ed949071cac2c894b3 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Tue, 26 May 2009 12:41:08 +1000
Subject: [PATCH] md: raid5: avoid sector values going negative when testing
 reshape progress.

As sector_t in unsigned, we cannot afford to let 'safepos' etc go
negative.
So replace
   a -= b;
by
   a -= min(b,a);

Signed-off-by: NeilBrown <neilb@suse.de>
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