UBI: add more prints

I hit those situations and found out lack of print messages. Add more prints
when erase problems occur.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index b0d8f4c..d42ec68 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -430,13 +430,16 @@
 	err = patt_count;
 
 out:
-	if (err == UBI_IO_BITFLIPS || err == -EBADMSG)
+	if (err == UBI_IO_BITFLIPS || err == -EBADMSG) {
 		/*
 		 * If a bit-flip or data integrity error was detected, the test
 		 * has not passed because it happened on a freshly erased
 		 * physical eraseblock which means something is wrong with it.
 		 */
+		ubi_err("read problems on freshly erased PEB %d, must be bad",
+			pnum);
 		err = -EIO;
+	}
 	vfree(buf);
 	return err;
 }
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index a5a9b8d..12b25e5 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1093,6 +1093,7 @@
 		return err;
 	}
 
+	ubi_err("failed to erase PEB %d, error %d", pnum, err);
 	kfree(wl_wrk);
 	kmem_cache_free(wl_entries_slab, e);