ARM: pxa: Use kmalloc_array() in pxa_pm_init()

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data type by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

arch/arm/mach-pxa/pm.c

@@ -104,7 +104,8 @@ static int __init pxa_pm_init(void)
 		return -EINVAL;
 	}
 
-	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
+	sleep_save = kmalloc_array(pxa_cpu_pm_fns->save_count,
+				   sizeof(*sleep_save),
 				   GFP_KERNEL);
 	if (!sleep_save) {
 		printk(KERN_ERR "failed to alloc memory for pm save\n");