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PCI: hv: Use struct_size() helper
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct hv_dr_state {
...
struct hv_pcidev_description func[];
};
struct pci_bus_relations {
...
struct pci_function_description func[];
} __packed;
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.
So, replace the following forms:
offsetof(struct hv_dr_state, func) +
(sizeof(struct hv_pcidev_description) *
(relations->device_count))
offsetof(struct pci_bus_relations, func) +
(sizeof(struct pci_function_description) *
(bus_rel->device_count))
with:
struct_size(dr, func, relations->device_count)
and
struct_size(bus_rel, func, bus_rel->device_count)
respectively.
Link: https://lore.kernel.org/r/20200525164319.GA13596@embeddedor
Signed-off-by: 
Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>