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Let's check the second time a global counter of "ha_warning" messages, if zero-warning is set. And let's do this just before forking. At this moment we are sure, that we've already done all init operations, where we could emit "ha_warning", and we still have stderr fd opened. Even with the second check, we could lost some late and rare warnings about failing to drop supplementary groups and about re-enabling core dumps. Notes about this are added into 'zero-warning' keyword description.