NeilBrown b8d966efd9 md: avoid dereferencing NULL pointer when accessing suspend_* sysfs attributes.
If we try to modify one of the md/ sysfs files
  suspend_lo or suspend_hi
when the array is not active, we dereference a NULL.
Protect against that.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
2009-07-01 11:14:04 +10:00
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