md/bitmap: clear bitmap if bitmap_create failed
If bitmap_create returns an error, we need to call either bitmap_destroy or bitmap_free to do clean up, and the selection is based on mddev->bitmap is set or not. And the sysfs_put(bitmap->sysfs_can_clear) is moved from bitmap_destroy to bitmap_free, and the comment of bitmap_create is changed as well. Signed-off-by: NGuoqing Jiang <gqjiang@suse.com> Signed-off-by: NShaohua Li <shli@fb.com>
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