coverity: fix type of local var

osmo_sccp_instance_next_conn_id() may return negative on error, so use
int instead of uint.

Fixup for recent 548d3d2f6639b728710b9a1905087a189f47de78
'use new osmo_sccp_instance_next_conn_id()'

Related: CID#316694
Change-Id: I2623c06c23691acb75f6ee6ff3a42ac7d10a4b1f
---
M src/osmo-hnbgw/context_map.c
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/osmo-hnbgw/context_map.c b/src/osmo-hnbgw/context_map.c
index cdc526b..2af685e 100644
--- a/src/osmo-hnbgw/context_map.c
+++ b/src/osmo-hnbgw/context_map.c
@@ -57,7 +57,7 @@
 								   bool is_ps)
 {
 	struct hnbgw_context_map *map;
-	uint32_t new_scu_conn_id;
+	int new_scu_conn_id;
 	struct hnbgw_cnlink *cnlink;
 	struct hnbgw_sccp_user *hsu;
 

