iwlwifi: dvm: use struct_size over open coded arithmetic

iwlwifi: dvm: use struct_size over open coded arithmetic

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kmalloc(). For example:

struct iwl_wipan_noa_data {
    ...
    u8 data[];
};

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@zte.com.cn>
Link: https://lore.kernel.org/r/20220210060926.1608378-1-chi.minghao@zte.com.cn
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>