b0db9388f6
When no log category is specified, `nullptr` is passed, and then the `_log()` function implementations replace that with `LogCategory::defaultCategory()`. But since the call site always knows the log category, this condition can be removed and the `_LOG1()` macro can use `LogCategory::defaultCategory()`. So remove the condition from the `_log()` implementations and use references to refer to log categories. Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>