Default set all data path driven header fields to 0, e.g. for udp_checksum.

applications/lofar2/libraries/sdp/src/vhdl/sdp_beamformer_output.vhd

@@ -99,7 +99,8 @@ ARCHITECTURE str OF sdp_beamformer_output IS
   SIGNAL common_fifo_rd_req : STD_LOGIC;
   SIGNAL payload_err        : STD_LOGIC_VECTOR(0 DOWNTO 0);
   
-  SIGNAL dp_offload_tx_hdr_fields : STD_LOGIC_VECTOR(1023 DOWNTO 0);
+  -- Default set all data path driven header fields to 0
+  SIGNAL dp_offload_tx_hdr_fields : STD_LOGIC_VECTOR(1023 DOWNTO 0) := (OTHERS=>'0');
 
 BEGIN