sgsn_libgtp: Use new per-GSN libgtp API instead of deprecated API

Depends: osmo-ggsn.git I653cbdc185165592d985e3efab6e3f1add97877b
Related: OS#2873
Change-Id: Iaaffe0ec4d9590309c62b62c446677c6f6732f2a
diff --git a/src/gprs/sgsn_libgtp.c b/src/gprs/sgsn_libgtp.c
index a8a1502..e9fffd8 100644
--- a/src/gprs/sgsn_libgtp.c
+++ b/src/gprs/sgsn_libgtp.c
@@ -153,7 +153,7 @@
 
 	imsi_ui64 = imsi_str2gtp(mmctx->imsi);
 
-	rc = pdp_newpdp(&pdp, imsi_ui64, nsapi, NULL);
+	rc = gtp_pdp_newpdp(ggsn->gsn, &pdp, imsi_ui64, nsapi, NULL);
 	if (rc) {
 		LOGP(DGPRS, LOGL_ERROR, "Out of libgtp PDP Contexts\n");
 		return NULL;