bcache: Fix a null ptr deref regression
Commit c0f04d88 ("bcache: Fix flushes in writeback mode") was fixing a reported data corruption bug, but it seems some last minute refactoring or rebasing introduced a null pointer deref. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: linux-stable <stable@vger.kernel.org> # >= v3.10 Reported-by: Gabriel de Perthuis <g2p.code@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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