Do not recheck DNS_ZONEFLG_LOADPENDING in zone_asyncload()
Remove a block of code which dates back to commit 8a2ab2b9, when dns_zone_asyncload() did not yet check DNS_ZONEFLG_LOADPENDING. Currently, no race in accessing DNS_ZONEFLG_LOADPENDING is possible any more, because: - dns_zone_asyncload() is still the only function which may queue zone_asyncload(), - dns_zone_asyncload() accesses DNS_ZONEFLG_LOADPENDING under a lock (and potentially queues an event under the same lock), - DNS_ZONEFLG_LOADPENDING is not cleared until the load actually completes. Thus, the rechecking code can be safely removed from zone_asyncload(). Note that this also brings zone_asyncload() to a state in which the completion callback is always invoked. This is required to prevent leaking memory in case something goes wrong in zone_asyncload() and a zone table the zone belongs to is indefinitely left with a positive reference count.
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