[PATCH] mtd: nand: don't leak buffers when ->scan_bbt() fails

[Brian Norris <computersforpeace@gmail.com>]

This bug seems to have been here forever, although we came close to
fixing all of them in [1]!

[1] 11eaf6df1cce ("mtd: nand: Remove BUG() abuse in nand_scan_tail")

Cc: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
The goto isn't *really* necessary, but I thought it'd be more consistent.

Compile tested only

 drivers/mtd/nand/nand_base.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 978242b1213f..e4919f9dece4 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4794,7 +4794,11 @@ int nand_scan_tail(struct mtd_info *mtd)
 		return 0;
 
 	/* Build bad block table */
-	return chip->scan_bbt(mtd);
+	ret = chip->scan_bbt(mtd);
+	if (ret)
+		goto err_free;
+	return 0;
+
 err_free:
 	if (nbuf) {
 		kfree(nbuf->databuf);
-- 
2.13.0.rc1.294.g07d810a77f-goog