WORKAROUND: mdadm hangs during reshape (PART #2)

WORKAROUND: mdadm hangs during reshape (PART #2)

After loop can occurs that due to 0 value reported by kernel
we have 0 in completed variable.
This is wrong. we are interested in real completed point.
0 value means that we reached sync point set in md,
so we can set completed variable to just reached point.
this point value is stored in max_progress variable.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>