ARM/smp_twd: Cleanup the unnecessary cast

It's not necessary to specify 'int' castingfor 'PTR_ERR(twd_clk)'.

Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>

arch/arm/kernel/smp_twd.c

@@ -199,7 +199,7 @@ static void twd_get_clock(struct device_node *np)
 		twd_clk = clk_get_sys("smp_twd", NULL);
 
 	if (IS_ERR(twd_clk)) {
-		pr_err("smp_twd: clock not found %d\n", (int) PTR_ERR(twd_clk));
+		pr_err("smp_twd: clock not found %d\n", PTR_ERR(twd_clk));
 		return;
 	}