UBI: Return -ENOMEM upon failing malloc

Return with correct error code (-ENOMEM) from ubi_attach_mtd_dev() upon
failing malloc().

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index bdf75c9..f4b01a9 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -784,19 +784,20 @@
 	if (err)
 		goto out_free;
 
+	err = -ENOMEM;
 	ubi->peb_buf1 = vmalloc(ubi->peb_size);
 	if (!ubi->peb_buf1)
 		goto out_free;
 
 	ubi->peb_buf2 = vmalloc(ubi->peb_size);
 	if (!ubi->peb_buf2)
-		 goto out_free;
+		goto out_free;
 
 #ifdef CONFIG_MTD_UBI_DEBUG
 	mutex_init(&ubi->dbg_buf_mutex);
 	ubi->dbg_peb_buf = vmalloc(ubi->peb_size);
 	if (!ubi->dbg_peb_buf)
-		 goto out_free;
+		goto out_free;
 #endif
 
 	err = attach_by_scanning(ubi);