jbd2: only create debugfs and stats entries if init is successful
jbd2 debugfs and stats entries should only be created if cache initialisation is successful. At the moment they are being created unconditionally which will leave them dangling if cache (and hence module) 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: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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