Use mbedtls_printf instead of printf

Replace usages of `printf()` with `mbedtls_printf()` in `aria.c`
which were accidently merged. Fixes #1908
diff --git a/ChangeLog b/ChangeLog
index abd5e61..61d0e4e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,6 +10,7 @@
    * Add ecc extensions only if an ecc based ciphersuite is used.
      This improves compliance to RFC 4492, and as a result, solves
      interoperability issues with BouncyCastle. Raised by milenamil in #1157.
+   * Replace printf with mbedtls_printf in aria. Found by TrinityTonic in #1908.
 
 Changes
    * Copy headers preserving timestamps when doing a "make install".