Update wrong references to bsc in sgsn code

Change-Id: I93f0dc721c2eff8a87fb9248882f24768f708713
diff --git a/src/gprs/gb_proxy_peer.c b/src/gprs/gb_proxy_peer.c
index a862a83..48482b6 100644
--- a/src/gprs/gb_proxy_peer.c
+++ b/src/gprs/gb_proxy_peer.c
@@ -32,7 +32,7 @@
 
 #include <string.h>
 
-extern void *tall_bsc_ctx;
+extern void *tall_sgsn_ctx;
 
 static const struct rate_ctr_desc peer_ctr_description[] = {
 	{ "blocked",	   "BVC Block                       " },
@@ -185,7 +185,7 @@
 {
 	struct gbproxy_peer *peer;
 
-	peer = talloc_zero(tall_bsc_ctx, struct gbproxy_peer);
+	peer = talloc_zero(tall_sgsn_ctx, struct gbproxy_peer);
 	if (!peer)
 		return NULL;