Use msg_flags instead of script level flags. Prevents unintentional c…

…ollision with script flags which could cause calls to mc_compact and mc_compress to fail.

(cherry picked from commit 0cfb7c3)

modules/compression/compression.c

@@ -653,15 +653,15 @@ static int mc_compact(struct sip_msg* msg, mc_whitelist_p wh_list, void* flags_p
 		goto error;
 	}
 
-	if (tm_api.t_gett && msg->flags&FL_TM_CB_REGISTERED)
+	if (tm_api.t_gett && msg->msg_flags&FL_TM_CB_REGISTERED)
 		goto error;
 
 	/*register tm callback if tm api */
 	if (tm_api.register_tmcb &&
 			tm_api.register_tmcb( msg, 0, TMCB_PRE_SEND_BUFFER,
 				wrap_tm_compact, NULL, 0) != 1) {
 		LM_ERR("failed to add tm TMCB_PRE_SEND_BUFFER callback\n");
-		msg->flags |= FL_TM_CB_REGISTERED;
+		msg->msg_flags |= FL_TM_CB_REGISTERED;
 		goto error;
 	}
 
@@ -1102,7 +1102,7 @@ static int mc_compress(struct sip_msg* msg, int *algo_p, int *flags_p,
 		goto end;
 	}
 
-	if (tm_api.t_gett && msg->flags&FL_TM_CB_REGISTERED) {
+	if (tm_api.t_gett && msg->msg_flags&FL_TM_CB_REGISTERED) {
 		ret = 1;
 		goto end;
 	}
@@ -1112,7 +1112,7 @@ static int mc_compress(struct sip_msg* msg, int *algo_p, int *flags_p,
 			tm_api.register_tmcb( msg, 0, TMCB_PRE_SEND_BUFFER,
 				wrap_tm_compress, NULL, 0) != 1) {
 		LM_ERR("failed to add tm TMCB_PRE_SEND_BUFFER callback\n");
-		msg->flags |= FL_TM_CB_REGISTERED;
+		msg->msg_flags |= FL_TM_CB_REGISTERED;
 		goto end;
 	}