nat: The reject cause of "-1" has failure meaning, change it
bsc_stat_reject is treating -1 as parsing failure but for the
global barring. Change it to another return value so it is
not counted as parsing failure.
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c b/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c
index d29ea9c..64f6d73 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c
@@ -163,7 +163,7 @@
LOGP(DNAT, LOGL_DEBUG,
"Blocking subscriber IMSI %s with CM: %d LU: %d\n",
imsi, cm, lu);
- return -1;
+ return -4;
}