Fix hmac_drbg failure in benchmark, with threading
Remove redunadnat calls to `hmac_drbg_free()` between seeding operations,
which make the mutex invalid. Fixes #1095
diff --git a/ChangeLog b/ChangeLog
index e28f39b..b7946c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Bugfix
+ * Fix efailure in hmac_drbg in the benchmark sample application, when
+ MBEDTLS_THREADING_C is defined. Found by TrinityTonic, #1095
+
= mbed TLS 2.1.14 branch released 2018-07-25
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