jbd: replace potentially false assertion with if block
If an error occurs during jbd cache initialisation it is possible for the journal_head_cache to be NULL when journal_destroy_journal_head_cache is called. Replace the J_ASSERT with an if block to handle the situation correctly. Note that even with this fix things will break badly if jbd is statically compiled in and cache initialisation fails. Signed-off-by: Duane Griffin <duaneg@dghda.com Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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