libvlr: use correct log facility within the VLR

Change-Id: Ia3170c3fe48402ab01bf994fd8d3fa8eec699647
diff --git a/src/libvlr/vlr.c b/src/libvlr/vlr.c
index e8ff1b1..e190132 100644
--- a/src/libvlr/vlr.c
+++ b/src/libvlr/vlr.c
@@ -476,7 +476,7 @@
 	for (tried = 0; tried < 100; tried++) {
 		rc = osmo_get_rand_id((uint8_t *) &tmsi, sizeof(tmsi));
 		if (rc < 0) {
-			LOGP(DDB, LOGL_ERROR, "osmo_get_rand_id() failed: %s\n", strerror(-rc));
+			LOGP(DVLR, LOGL_ERROR, "osmo_get_rand_id() failed: %s\n", strerror(-rc));
 			return rc;
 		}