libethernet: bcm: do not overwrite stats available through proc

bcm/bcm.c

@@ -286,6 +286,8 @@ int bcm_eth_get_stats(const char *ifname, struct eth_stats *s)
 
 	/* get from proc first */
 	ret_proc = bcm_eth_get_stats_from_proc(ifname, s);
+	if (!ret_proc)
+		return 0;
 
 	memset(&data, 0, sizeof(struct ethswctl_data));
 	ret = bcm_eth_get_unit_port(ifname, &unit, &port);