dm: remove dm_mutex after bkl conversion
This patch replaces dm_mutex with _minor_lock in dm_blk_close() and then removes it. During the BKL conversion, commit 6e9624b8 (block: push down BKL into .open and .release) pushed lock_kernel() down into dm_blk_open/close calls. Commit 2a48fc0a (block: autoconvert trivial BKL users to private mutex) converted it to a local mutex, but _minor_lock is sufficient. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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