To be on the safe side, do not touch lrb after clearing its slot in the
lrb_in_use bitmap to avoid messing up the next task which would possibly
occupy this lrb.

[mkp: applied by hand]

Link: https://lore.kernel.org/r/1574751214-8321-4-git-send-email-cang@qti.qualcomm.com
Reviewed by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>