fix for CID 330416 memory leak

Author: JacobBarthelmeh

wolfcrypt/src/hpke.c

@@ -785,8 +785,10 @@ static int wc_HpkeEncap(Hpke* hpke, void* ephemeralKey, void* receiverKey,
 #ifdef ECC_TIMING_RESISTANT
             rng = wc_rng_new(NULL, 0, hpke->heap);
 
-            if (rng == NULL)
-                return RNG_FAILURE_E;
+            if (rng == NULL) {
+                ret = RNG_FAILURE_E;
+                break;
+            }
 
             wc_ecc_set_rng((ecc_key*)ephemeralKey, rng);
 #endif