Fix typos in ChangeLog and comments
diff --git a/include/polarssl/base64.h b/include/polarssl/base64.h
index dd11bda..f862192 100644
--- a/include/polarssl/base64.h
+++ b/include/polarssl/base64.h
@@ -46,7 +46,7 @@
* *dlen is always updated to reflect the amount
* of data that has (or would have) been written.
* If that length cannot be represented, then no data is
- * written to the buffer and *olen is set to SIZE_T_MAX.
+ * written to the buffer and *dlen is set to SIZE_T_MAX.
*
* \note Call this function with *dlen = 0 to obtain the
* required buffer size in *dlen