[PATCH] mtd: nand: check nand_mtd_to_devnum() argument

[Dario Binacchi]

If the "mtd" parameter is NULL, the search will definitely yield a
negative result. In that case, it's better to exit immediately.

Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>

---

 drivers/mtd/nand/raw/nand.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/nand.c b/drivers/mtd/nand/raw/nand.c
index eacd99c4e275..55c00ac815dd 100644
--- a/drivers/mtd/nand/raw/nand.c
+++ b/drivers/mtd/nand/raw/nand.c
@@ -41,8 +41,11 @@ int nand_mtd_to_devnum(struct mtd_info *mtd)
 {
 	int i;
 
+	if (!mtd)
+		return -ENODEV;
+
 	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
-		if (mtd && get_nand_dev_by_index(i) == mtd)
+		if (get_nand_dev_by_index(i) == mtd)
 			return i;
 	}
 
-- 
2.42.0