Don't try to remove a bad .QWK packet if it's been renamed to *.bad.

src/sbbs3/main.cpp

@@ -2872,7 +2872,7 @@ void event_thread(void* arg)
 						sbbs->delfiles(sbbs->cfg.temp_dir,ALLFILES);
 						sbbs->console&=~CON_L_ECHO;
 						sbbs->online=FALSE;
-						if(remove(str))
+						if(fexist(str) && remove(str))
 							sbbs->errormsg(WHERE, ERR_REMOVE, str, 0);
 					}
 				}