FS-8370 [mod_rayo] found another place in <prompt> where a message was freed…

FS-8370 [mod_rayo] found another place in <prompt> where a message was freed after being queued for delivery. This resulted in a freed object being serialized, crashing FS.

src/mod/event_handlers/mod_rayo/rayo_prompt_component.c

@@ -288,7 +288,7 @@ static iks *prompt_component_handle_input_error(struct rayo_actor *prompt, struc
 			RAYO_SEND_REPLY(prompt, RAYO_COMPONENT(prompt)->client_jid, iq);
 
 			/* done */
-			iks_delete(PROMPT_COMPONENT(prompt)->iq);
+			PROMPT_COMPONENT(prompt)->iq = NULL;
 			RAYO_RELEASE(prompt);
 			RAYO_DESTROY(prompt);