linux-next: build warning after merge of the md tree

[Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>]

Hi Shaohua,

After merging the md tree, today's linux-next build (powerpc
ppc64_defconfig) produced this warning:

drivers/md/raid5-cache.c: In function 'r5c_journal_mode_show':
drivers/md/raid5-cache.c:2535:2: warning: ignoring return value of 'mddev_lock', declared with attribute warn_unused_result [-Wunused-result]
  mddev_lock(mddev);
  ^

Introduced by commit

  7f7abe0ec5bb ("md/r5cache: call mddev_lock/unlock() in r5c_journal_mode_show")

-- 
Cheers,
Stephen Rothwell
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