Fix FEC block bug

prrt/proto/types/block.c

@@ -33,7 +33,7 @@ static void gather_redundancy_packets(const PrrtBlock *block_ptr, gf *const *fec
                 packet->payload + PRRT_PACKET_REDUNDANCY_HEADER_SIZE,
                 PACKET_TYPE_DATA,
                 fec[m],
-                packet->payloadLength
+                packet->payloadLength - PRRT_PACKET_REDUNDANCY_HEADER_SIZE
         );
         idx_p[m] = packet->index;
     }