md: fix double free of io_acct_set bioset
commit 42b805af upstream. Now io_acct_set is alloc and free in personality. Remove the codes that free io_acct_set in md_free and md_stop. Fixes: 0c031fd3 (md: Move alloc/free acct bioset in to personality) Signed-off-by: Xiao Ni <xni@redhat.com> Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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f63fd1e0
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