Remove variable assignment without effect

We're breaking out of the loop here anyway, so setting done to true is
useless.

src/switch_ivr_play_say.c

@@ -325,7 +325,6 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_phrase_macro_event(switch_core_sessio
 		}
 
 		if (status != SWITCH_STATUS_SUCCESS) {
-			done = 1;
 			break;
 		}