cosmetic: use osmo_strlcpy() everywhere

Shorten some code and make obvious to the reader that the string copy is done
in a safe way.

Change-Id: I900726cf06d34128db22a3d3d911ee0d1423b1bd
diff --git a/openbsc/src/libmsc/vty_interface_layer3.c b/openbsc/src/libmsc/vty_interface_layer3.c
index 4f412b1..490d794 100644
--- a/openbsc/src/libmsc/vty_interface_layer3.c
+++ b/openbsc/src/libmsc/vty_interface_layer3.c
@@ -567,8 +567,7 @@
 		return CMD_WARNING;
 	}
 
-	strncpy(subscr->name, name, sizeof(subscr->name));
-	subscr->name[sizeof(subscr->name)-1] = '\0';
+	osmo_strlcpy(subscr->name, name, sizeof(subscr->name));
 	talloc_free(name);
 	db_sync_subscriber(subscr);