Always initialize 'decryptedKey'

Warning 750167.5627928

Author: Andras Fekete

wolfcrypt/src/pkcs7.c

@@ -11830,10 +11830,6 @@ WOLFSSL_API int wc_PKCS7_DecodeAuthEnvelopedData(PKCS7* pkcs7, byte* in,
     }
 #endif
 
-#ifndef WOLFSSL_SMALL_STACK
-    XMEMSET(decryptedKey, 0, MAX_ENCRYPTED_KEY_SZ);
-#endif
-
     switch (pkcs7->state) {
         case WC_PKCS7_START:
         case WC_PKCS7_INFOSET_START:
@@ -11872,6 +11868,7 @@ WOLFSSL_API int wc_PKCS7_DecodeAuthEnvelopedData(PKCS7* pkcs7, byte* in,
             pkcs7->stream->key = decryptedKey;
         #endif
         #endif
+            XMEMSET(decryptedKey, 0, MAX_ENCRYPTED_KEY_SZ);
             FALL_THROUGH;
 
         case WC_PKCS7_DECRYPT_KTRI: