[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>
diff --git a/drivers/mtd/maps/nettel.c b/drivers/mtd/maps/nettel.c
index f9e8e5b..528e523 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 @@
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;
