Fixed spelling / typos (from PowerDNS:codespell)
diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index 01cc455..e75f9d7 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -1425,7 +1425,7 @@
  *
  * \param ssl      SSL context
  *
- * \return         0 if succesful, or any ssl_handshake() return value.
+ * \return         0 if successful, or any ssl_handshake() return value.
  */
 int ssl_renegotiate( ssl_context *ssl );