mmc: block: Fix error path of mmc_blk_alloc_req()

In case of any error within mmc_blk_alloc_req(), the bitmaps
that keep track of devices are not getting cleared. This may
result in failure to detect a card in case it reaches maximum
devices limitation. Fix it by clearing those bitmaps appropriately.

CRs-fixed: 563264
Change-Id: I0e23c45856355565534146f5fabb957fd4b1d007
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index e5315bd..743668b 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -2800,8 +2800,11 @@
  err_putdisk:
 	put_disk(md->disk);
  err_kfree:
+	if (!subname)
+		__clear_bit(md->name_idx, name_use);
 	kfree(md);
  out:
+	__clear_bit(devidx, dev_use);
 	return ERR_PTR(ret);
 }