[MTD] return error code from get_mtd_device()

get_mtd_device() returns NULL in case of any failure. Teach it to return an
error code instead. Fix all users as well.

Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mtd/maps/nettel.c b/drivers/mtd/maps/nettel.c
index f9e8e5bcbc33..528e523245c2 100644
--- a/drivers/mtd/maps/nettel.c
+++ b/drivers/mtd/maps/nettel.c
@@ -20,6 +20,7 @@
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/cfi.h>
 #include <linux/reboot.h>
+#include <linux/err.h>
 #include <linux/kdev_t.h>
 #include <linux/root_dev.h>
 #include <asm/io.h>
@@ -178,7 +179,7 @@ int nettel_eraseconfig(void)
 
         init_waitqueue_head(&wait_q);
         mtd = get_mtd_device(NULL, 2);
-        if (mtd) {
+        if (!IS_ERR(mtd)) {
                 nettel_erase.mtd = mtd;
                 nettel_erase.callback = nettel_erasecallback;
                 nettel_erase.callback = NULL;