ARM: bcm: fix a leaked reference by adding missing of_node_put

The call to of_get_next_child returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./arch/arm/mach-bcm/board_bcm281xx.c:43:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 35, but without a corresponding object release within this function.
./arch/arm/mach-bcm/platsmp-brcmstb.c:337:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 329, but without a corresponding object release within this function.
./arch/arm/mach-bcm/platsmp-brcmstb.c:341:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 329, but without a corresponding object release within this functio
./arch/arm/mach-bcm/bcm63xx_smp.c:150:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 130, but without a corresponding object release within this function.
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Gregory Fong <gregory.0xf0@gmail.com>
Acked-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/mach-bcm/bcm63xx_smp.c

@@ -142,6 +142,7 @@ static int bcm63138_smp_boot_secondary(unsigned int cpu,
 	 * return
 	 */
 	ret = bcm63xx_pmb_power_on_cpu(dn);
+	of_node_put(dn);
 	if (ret)
 		goto out;
 out:

arch/arm/mach-bcm/board_bcm281xx.c

@@ -38,6 +38,7 @@ static void bcm281xx_restart(enum reboot_mode mode, const char *cmd)
 		return;
 	}
 	base = of_iomap(np_wdog, 0);
+	of_node_put(np_wdog);
 	if (!base) {
 		pr_emerg("Couldn't map brcm,kona-wdt\n");
 		return;

arch/arm/mach-bcm/platsmp-brcmstb.c

@@ -334,11 +334,14 @@ static void __init brcmstb_cpu_ctrl_setup(unsigned int max_cpus)
 
 	rc = setup_hifcpubiuctrl_regs(np);
 	if (rc)
-		return;
+		goto out_put_node;
 
 	rc = setup_hifcont_regs(np);
 	if (rc)
-		return;
+		goto out_put_node;
+
+out_put_node:
+	of_node_put(np);
 }
 
 static int brcmstb_boot_secondary(unsigned int cpu, struct task_struct *idle)