Don't consider disks with a valid recovery offset as candidates for bumping up event count

When we are looking for a candidate disk to bump up the event count,
we consider only disks that have recovery_start==MaxSector.
However, after we find one such disk, we agree to accept more disks
having same event count, regardless of their recovery_start.
Be consistent and don't accept disks with a valid recovery_start at all.

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

Assemble.c

@@ -1069,6 +1069,7 @@ int Assemble(struct supertype *st, char *mddev,
 			int j = best[i];
 			if (j >= 0 &&
 			    !devices[j].uptodate &&
+			    devices[j].i.recovery_start == MaxSector &&
 			    devices[j].i.events == current_events) {
 				chosen_drive = j;
 				goto add_another;