fix: Resolve memory leak in stanza_parse by freeing parse state

src/server/stanza.c

@@ -299,7 +299,9 @@ stanza_parse(char *stanza_text)
     XML_Parse(parser, stanza_text, strlen(stanza_text), 0);
     XML_ParserFree(parser);
 
-    return state->curr_stanza;
+    XMPPStanza *result = state->curr_stanza;
+    free(state);
+    return result;
 }
 
 static void