trusty:tui: fix leak on error path.

Bug: 283322052
Test: confui on target
Change-Id: I1faaf6ed8acd17afecdf3b1d42121f2063d7cae8
diff --git a/src/main.cpp b/src/main.cpp
index f098aef..b6f3ad6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -224,6 +224,7 @@
         TLOGE("%s, get auth token key failed\n", __func__);
         /* Abort operation and free all resources. */
         op->abort();
+        free(ctx);
         return ERR_GENERIC;
     }
     op->setHmacKey(authKey);