key: clear out secret data in DecodeExtKey

Same as in `DecodeSecret`, we should also clear out the secret data from
the vector resulting from the Base58Check parsing for xprv keys. Note
that the if condition is needed in order to avoid UB, see #14242 (commit
d855e4cac8303ad4e34ac31cfa7634286589ce99).

Github-Pull: #31166
Rebased-From: 559a8dd9c0aafcecf00f9ccd9aabe5720bcebe8c

src/key_io.cpp

@@ -274,6 +274,9 @@ CExtKey DecodeExtKey(const std::string& str)
             key.Decode(data.data() + prefix.size());
         }
     }
+    if (!data.empty()) {
+        memory_cleanse(data.data(), data.size());
+    }
     return key;
 }