mtd: introduce mtd_put_device interface

[Dan Carpenter]

This patch is in linux-next.  The parts of this patch that touch
logfs are completely bogus and need to be reverted.  Eggnog...

fs/logfs/super.c:507:2: warning: passing argument 1 of ‘mtd_put_device’ from incompatible pointer type [enabled by default]
fs/logfs/super.c:526:3: warning: passing argument 1 of ‘mtd_put_device’ from incompatible pointer type [enabled by default]
fs/logfs/super.c:533:3: warning: passing argument 1 of ‘mtd_put_device’ from incompatible pointer type [enabled by default]

regards,
dan carpenter
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