handle lookup errors when connecting

Connect may result in lookup error, which was not handled. Solve this by
use a default error handler which returns whatever mosquitto reports.

This prevents us from missing errors.

lua-mosquitto.c

@@ -99,21 +99,20 @@ static int mosq__pstatus(lua_State *L, int mosq_errno) {
 			return luaL_error(L, mosquitto_strerror(mosq_errno));
 			break;
 
-		case MOSQ_ERR_NO_CONN:
-		case MOSQ_ERR_CONN_LOST:
-		case MOSQ_ERR_PAYLOAD_SIZE:
+		case MOSQ_ERR_ERRNO:
 			lua_pushnil(L);
-			lua_pushinteger(L, mosq_errno);
-			lua_pushstring(L, mosquitto_strerror(mosq_errno));
+			lua_pushinteger(L, errno);
+			lua_pushstring(L, strerror(errno));
 			return 3;
 			break;
 
-		case MOSQ_ERR_ERRNO:
+		default:
 			lua_pushnil(L);
-			lua_pushinteger(L, errno);
-			lua_pushstring(L, strerror(errno));
+			lua_pushinteger(L, mosq_errno);
+			lua_pushstring(L, mosquitto_strerror(mosq_errno));
 			return 3;
 			break;
+
 	}
 
 	return 0;