platform/x86: asus-wmi: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.
Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/asus-wmi.c

@@ -292,12 +292,11 @@ static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
 	 * Copy to dma capable address otherwise memory corruption occurs as
 	 * bios has to be able to access it.
 	 */
-	input.pointer = kzalloc(args.length, GFP_DMA | GFP_KERNEL);
+	input.pointer = kmemdup(args.pointer, args.length, GFP_DMA | GFP_KERNEL);
 	input.length = args.length;
 	if (!input.pointer)
 		return -ENOMEM;
 	phys_addr = virt_to_phys(input.pointer);
-	memcpy(input.pointer, args.pointer, args.length);
 
 	status = asus_wmi_evaluate_method(ASUS_WMI_METHODID_AGFN,
 					phys_addr, 0, &retval);