mfd: ab8500-sysctrl: Let sysctrl driver work without pdata

A check for a valid plat->sysctrl was introduced in:

2377e52f mfd: ab8500-sysctrl: Error check clean up

but the driver works just fine even without that initialization data,
and enforcing it breaks existing platforms for no reason.

This patch removes the check and let the driver go ahead with probe.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/ab8500-sysctrl.c

@@ -104,7 +104,7 @@ void ab8500_restart(char mode, const char *cmd)
 
 	plat = dev_get_platdata(sysctrl_dev->parent);
 	pdata = plat->sysctrl;
-	if (pdata->reboot_reason_code)
+	if (pdata && pdata->reboot_reason_code)
 		reason = pdata->reboot_reason_code(cmd);
 	else
 		pr_warn("[%s] No reboot reason set. Default reason %d\n",
@@ -188,7 +188,7 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 
 	plat = dev_get_platdata(pdev->dev.parent);
 
-	if (!(plat && plat->sysctrl))
+	if (!plat)
 		return -EINVAL;
 
 	sysctrl_dev = &pdev->dev;
@@ -197,7 +197,6 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 		pm_power_off = ab8500_power_off;
 
 	pdata = plat->sysctrl;
-
 	if (pdata) {
 		int last, ret, i, j;