md: range check slot number when manually adding a spare.
When adding a spare to an active array, we should check the slot
number, but allow it to be larger than raid_disks if a reshape
is being prepared.
Apply the same test when adding a device to an
array-under-construction. It already had most of the test in place,
but not quite all.
Signed-off-by: NNeilBrown <neilb@suse.de>
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