riscv: remove redundant logical constraint.

After

    if (ret) return ret;

we know that ret is zero. Don't check it again.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Rick Chen <rick@andestech.com>

arch/riscv/lib/andes_plic.c

@@ -52,7 +52,7 @@ static int init_plic(void)
 	if (ret)
 		return ret;
 
-	if (ret == 0 && dev) {
+	if (dev) {
 		ofnode_for_each_subnode(node, dev_ofnode(dev->parent)) {
 			const char *device_type;