HID: hyperv: avoid struct memcpy overrun warning

In the Linux kernel, the following vulnerability has been resolved:

HID: hyperv: avoid struct memcpy overrun warning

A previous patch addressed the fortified memcpy warning for most

builds, but I still see this one with gcc-9:

In file included from include/linux/string.h:254,

from drivers/hid/hid-hyperv.c:8:

In function 'fortify_memcpy_chk',

inlined from 'mousevsc_on_receive' at drivers/hid/hid-hyperv.c:272:3:

include/linux/fortify-string.h:583:4: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]

583 | __write_overflow_field(p_size_field, size);

| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

My guess is that the WARN_ON() itself is what confuses gcc, so it no

longer sees that there is a correct range check. Rework the code in a

way that helps readability and avoids the warning.