Remove `struct ndpi_id_struct` (#1427)

Remove the last uses of `struct ndpi_id_struct`.
That code is not really used and it has not been updated for a very long
time: see #1279 for details.

Correlation among flows is achieved via LRU caches.

This change allows to further reduce memory consumption (see also
91bb77a8).

At nDPI 4.0 (more precisly, at a6b10cf, because memory stats
were wrong until that commit):
```
nDPI Memory statistics:
	nDPI Memory (once):      221.15 KB
	Flow Memory (per flow):  2.94 KB
```
Now:
```
nDPI Memory statistics:
	nDPI Memory (once):      235.27 KB
	Flow Memory (per flow):  688 B        <--------
```
i.e. memory usage per flow has been reduced by 77%.

Close #1279

1 files changed, 1 insertions, 7 deletions

diff --git a/fuzz/fuzz_process_packet.c b/fuzz/fuzz_process_packet.c
index b8780b7a8..8841c0a1c 100644
--- a/fuzz/fuzz_process_packet.c
+++ b/fuzz/fuzz_process_packet.c
@@ -4,8 +4,6 @@
 #include <stdio.h>
 
 struct ndpi_detection_module_struct *ndpi_info_mod = NULL;
-struct ndpi_id_struct *src;
-struct ndpi_id_struct *dst;
 
 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   uint8_t protocol_was_guessed;
@@ -16,8 +14,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
     NDPI_BITMASK_SET_ALL(all);
     NDPI_BITMASK_SET_ALL(debug_bitmask);
     ndpi_set_protocol_detection_bitmask2(ndpi_info_mod, &all);
-    src = ndpi_malloc(SIZEOF_ID_STRUCT);
-    dst = ndpi_malloc(SIZEOF_ID_STRUCT);
     ndpi_set_log_level(ndpi_info_mod, 4);
     ndpi_set_debug_bitmask(ndpi_info_mod, debug_bitmask);
     ndpi_finalize_initialization(ndpi_info_mod);
@@ -25,9 +21,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 
   struct ndpi_flow_struct *ndpi_flow = ndpi_flow_malloc(SIZEOF_FLOW_STRUCT);
   memset(ndpi_flow, 0, SIZEOF_FLOW_STRUCT);
-  memset(src, 0, SIZEOF_ID_STRUCT);
-  memset(dst, 0, SIZEOF_ID_STRUCT);
-  ndpi_detection_process_packet(ndpi_info_mod, ndpi_flow, Data, Size, 0, src, dst);
+  ndpi_detection_process_packet(ndpi_info_mod, ndpi_flow, Data, Size, 0);
   ndpi_detection_giveup(ndpi_info_mod, ndpi_flow, 1, &protocol_was_guessed);
   ndpi_free_flow(ndpi_flow);