ns2: Memory allocation failures are ENOMEM, not ENOSPC

ENOSPC is used with non-volatile (disk) storage, while ENOMEM is
customarily used for RAM allocation failures.

Change-Id: Ia4c16d8278dc30c7cc69169b18428cda5272738d
diff --git a/src/gb/gprs_ns2.c b/src/gb/gprs_ns2.c
index 4f3bc5e..2dde693 100644
--- a/src/gb/gprs_ns2.c
+++ b/src/gb/gprs_ns2.c
@@ -1367,12 +1367,12 @@
 
 	bind = talloc_zero(nsi, struct gprs_ns2_vc_bind);
 	if (!bind)
-		return -ENOSPC;
+		return -ENOMEM;
 
 	bind->name = talloc_strdup(bind, name);
 	if (!bind->name) {
 		talloc_free(bind);
-		return -ENOSPC;
+		return -ENOMEM;
 	}
 
 	bind->nsi = nsi;