state: bucket_circular: -EUCLEAN means data could be read

-EUCLEAN returned from state_mtd_peb_read() means that the
data shall still be used. This fixes initialization of buckets
which need cleanup

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common/state/backend_bucket_circular.c

@@ -390,7 +390,7 @@ static int state_backend_bucket_circular_init(
 
 		ret = state_mtd_peb_read(circ, buf, sub_offset,
 					 circ->writesize);
-		if (ret)
+		if (ret && ret != -EUCLEAN)
 			return ret;
 
 		ret = mtd_buf_all_ff(buf, circ->writesize);