net: airoha: Fix a NULL vs IS_ERR() bug in airoha_npu_run_firmware()

The devm_ioremap_resource() function returns error pointers.  It never
returns NULL.  Update the check to match.

Fixes: e27dba1 ("net: Use of_reserved_mem_region_to_resource{_byname}() for "memory-region"")
Signed-off-by: Dan Carpenter <[email protected]>
Acked-by: Lorenzo Bianconi <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Dan Carpenter

drivers/net/ethernet/airoha/airoha_npu.c

@@ -179,8 +179,8 @@ static int airoha_npu_run_firmware(struct device *dev, void __iomem *base,
 	}
 
 	addr = devm_ioremap_resource(dev, res);
-	if (!addr) {
-		ret = -ENOMEM;
+	if (IS_ERR(addr)) {
+		ret = PTR_ERR(addr);
 		goto out;
 	}