CVE-2026-13343 Uninitialised stack memory disclosure in the MIDI 2.0 UMP Stream responder

The UMP Stream responder library in lib/midi2/umpstreamresponder.c builds reply packets in a 16-byte struct midiump uint32t data4. The builders makeendpointinfo and makefunctionblockinfo populate only the first two words res.data0 and res.data1 and, before this fix, declared their result as an...