struct gprs_rlcmac_bts: remove unused 'nsei' field

The code in gprs_nsvc_create_and_connect() stores NSEI there for
no reason, despite it's already stored in struct gprs_ns2_nse.

Change-Id: Ib30152a12384cf0448104a1ee1cfb949f4a27553
diff --git a/src/bts.h b/src/bts.h
index e930463..4340199 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -178,7 +178,6 @@
 	struct gprs_ns2_inst *nsi;
 	/* main nsei */
 	struct gprs_ns2_nse *nse;
-	uint16_t nsei;
 };
 
 enum {
diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp
index 143d4dc..e0cfc37 100644
--- a/src/gprs_bssgp_pcu.cpp
+++ b/src/gprs_bssgp_pcu.cpp
@@ -947,7 +947,6 @@
 		return 1;
 	}
 
-	bts->nsei = nsei;
 	if (bts->gb_dialect_sns) {
 		rc = gprs_ns2_ip_connect_sns(bind, sgsn, nsei);
 	} else {