Avoid use of uninitialized array

wolfcrypt/src/hpke.c

@@ -1125,6 +1125,7 @@ static int wc_HpkeContextOpenBase(Hpke* hpke, HpkeBaseContext* context,
         return BAD_FUNC_ARG;
     }
 
+    XMEMSET(nonce, 0, sizeof(nonce));
 #ifdef WOLFSSL_SMALL_STACK
     aes_key = (Aes*)XMALLOC(sizeof(Aes), hpke->heap, DYNAMIC_TYPE_AES);
     if (aes_key == NULL) {

wolfcrypt/src/pkcs7.c

@@ -8693,6 +8693,7 @@ static int wc_PKCS7_DecryptKtri(PKCS7* pkcs7, byte* in, word32 inSz,
     mp_int serialNum[1];
     RsaKey privKey[1];
 #endif
+    XMEMSET(issuerHash, 0, sizeof(issuerHash));
 
 #if defined(WOLFSSL_SM2) && defined(WOLFSSL_SM3)
     keyIdSize = wc_HashGetDigestSize(wc_HashTypeConvert(HashIdAlg(