[][kernel][common][eth][Fix Coverity scan warning]

[Description]
Fix Coverity scan warning.

[Release-log]
N/A


Change-Id: I7867c00156d1e439071cd8e606212d4ae011a52a
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6840068
diff --git a/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_usxgmii.c b/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_usxgmii.c
index 7d4a3ed..bdd5231 100644
--- a/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_usxgmii.c
+++ b/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_usxgmii.c
@@ -118,7 +118,7 @@
 {
 	u32 id = mtk_mac2xgmii_id(ss->eth, mac_id);
 
-	if (id < 0 || id >= MTK_MAX_DEVS ||
+	if (id >= MTK_MAX_DEVS ||
 	    !ss->regmap_usxgmii[id] || !ss->regmap_pextp[id])
 		return;
 
@@ -189,7 +189,7 @@
 	unsigned int val;
 	u32 id = mtk_mac2xgmii_id(ss->eth, mac_id);
 
-	if (id < 0 || id >= MTK_MAX_DEVS ||
+	if (id >= MTK_MAX_DEVS ||
 	    !ss->regmap_usxgmii[id] || !ss->regmap_pextp[id])
 		return;
 
@@ -292,7 +292,7 @@
 	struct mtk_eth *eth = ss->eth;
 	u32 id = mtk_mac2xgmii_id(eth, mac_id);
 
-	if (id < 0 || id >= MTK_MAX_DEVS || !eth->toprgu)
+	if (id >= MTK_MAX_DEVS || !eth->toprgu)
 		return;
 
 	switch (mac_id) {