gprs_ns2: SNS: allow transition missing transition GPRS_SNS_ST_UNCONFIGURED

A transistion from GPRS_SNS_ST_UNCONFIGURED -> GPRS_SNS_ST_UNCONFIGURED.

Related: OS#5036
Change-Id: I125e7e5a08ea6aff6e0308a18b5c0a6d0392ad32
diff --git a/src/gb/gprs_ns2_sns.c b/src/gb/gprs_ns2_sns.c
index 18f388d..c6e80af 100644
--- a/src/gb/gprs_ns2_sns.c
+++ b/src/gb/gprs_ns2_sns.c
@@ -1378,7 +1378,8 @@
 static const struct osmo_fsm_state ns2_sns_bss_states[] = {
 	[GPRS_SNS_ST_UNCONFIGURED] = {
 		.in_event_mask = 0, /* handled by all_state_action */
-		.out_state_mask = S(GPRS_SNS_ST_BSS_SIZE),
+		.out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |
+				  S(GPRS_SNS_ST_BSS_SIZE),
 		.name = "UNCONFIGURED",
 		.action = ns2_sns_st_bss_unconfigured,
 	},