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

[Stephen Rothwell]

Hi all,

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

fs/btrfs/free-space-cache.c: In function 'load_free_space_cache':
fs/btrfs/free-space-cache.c:929:31: warning: variable 'mapping' set but not used [-Wunused-but-set-variable]
  929 |         struct address_space *mapping;
      |                               ^~~~~~~

Introduced by commit

  22d85ab1af7d ("btrfs: Change the lockdep class of struct inode's invalidate_lock")

-- 
Cheers,
Stephen Rothwell

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