powerpc/pseries: Use kmemdup

While looking at some code paths I came across this code that zeros
memory then copies over the entire length.

Signed-off-by: Milton Miller <[e-mail]>
Signed-off-by: Nishanth Aravamudan <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/platforms/pseries/dlpar.c

···
 
 	prop->length = ccwa->prop_length;
 	value = (char *)ccwa + ccwa->prop_offset;
-	prop->value = kzalloc(prop->length, GFP_KERNEL);
+	prop->value = kmemdup(value, prop->length, GFP_KERNEL);
 	if (!prop->value) {
 		dlpar_free_cc_property(prop);
 		return NULL;
 	}
 
-	memcpy(prop->value, value, prop->length);
 	return prop;
 }