mtd_blkdevs: don't hold del_mtd_blktrans_dev in blktrans_{open, release}
There is nothing that this protects against except for slightly reducing the window when new opens can appear just before calling del_gendisk. Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20210823073359.705281-2-hch@lst.de
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a89d69a4