UBI: remove unneeded error checks

Pointed to by viro.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 78cae49..4a458e8 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -38,9 +38,8 @@
 	const struct ubi_device *ubi;
 
 	if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES ||
-	    !ubi_devices[ubi_num]) {
+	    !ubi_devices[ubi_num])
 		return -ENODEV;
-	}
 
 	ubi = ubi_devices[ubi_num];
 	di->ubi_num = ubi->ubi_num;