The signature (uint32_t service label, const NpUnifiedEntitlementLabel*)
follows SharpProspero Interop/AppContent/AppContent.cs (5dfdb4b0). dlc_emu
dlc_content.cpp (fcf69b16) answers NOT_FOUND for a label that is not a
known add-on and PARAMETER for a null label. No add-on content is ever
installed here, as sceAppContentAddcontMount and sceAppContentGetAddcontInfo
already model, so every non-null label answers NOT_FOUND and nothing is
queued. dlc_emu's nonzero-padding check is left out, as sibling functions
do not check it and no console source confirms it.
Carried from @screamm with author attribution preserved.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
fdfe2204aa