[proto_hep] fix bug introduced in 7190a2d

	Commit 7190a2d was freeing the extra chunks twice when
the message was processed as SIP. Now the original hep context
free function is not registered as a context free function, but
called manually each time all the hep processing is done. This
way we avoid the memory leaks that appeared when the message was
not a SIP message, and the chunks were not freed.

(cherry picked from commit 63b2a52)

modules/proto_hep/hep.c

@@ -778,26 +778,3 @@ int unpack_hepv3(char *buf, int len, struct hep_desc *h)
 
 	return 0;
 }
-
-void free_extra_chunks(struct hep_desc* h)
-{
-	generic_chunk_t *it, *foo=NULL;
-	if (h == NULL)
-		return;
-
-	if (h->version < 3 || h->u.hepv3.chunk_list == NULL)
-		return;
-
-	for (it=h->u.hepv3.chunk_list; it; foo=it, it=it->next) {
-		if (foo) {
-			shm_free(foo->data);
-			shm_free(foo);
-		}
-	}
-
-	if (foo) {
-		shm_free(foo->data);
-		shm_free(foo);
-	}
-
-}

modules/proto_hep/proto_hep.c

@@ -192,7 +192,7 @@ static int mod_init(void)
 		}
 	}
 
-	hep_ctx_idx = context_register_ptr(CONTEXT_GLOBAL, free_hep_context);
+	hep_ctx_idx = context_register_ptr(CONTEXT_GLOBAL, 0);
 
 	return 0;
 }
@@ -941,7 +941,7 @@ static inline int hep_handle_req(struct tcp_req *req,
 				receive_msg(msg_buf, msg_len, &local_rcv, ctx) <0)
 				LM_ERR("receive_msg failed \n");
 
-		free_extra_chunks(&hep_ctx->h);
+		free_hep_context(hep_ctx);
 
 		if (!size && req != &hep_current_req) {
 			/* if we no longer need this tcp_req
@@ -1282,7 +1282,7 @@ static int hep_udp_read_req(struct socket_info *si, int* bytes_read)
 		receive_msg( msg.s, msg.len, &ri, ctx);
 	}
 
-	free_extra_chunks(&hep_ctx->h);
+	free_hep_context(hep_ctx);
 
 	return 0;