ice: 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 foo {
    int stuff;
    struct boo entry[];
};

size = sizeof(struct foo) + count * sizeof(struct boo); instance = alloc(size, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper:

size = struct_size(instance, entry, count);

This code was detected with the help of Coccinelle.

---
 drivers/net/ethernet/intel/ice/ice_sched.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index e0218f4c8f0b..a2dd7c74bba3 100644
@@ -664,10 +664,10 @@ ice_sched_add_elems(struct ice_port_info *pi, struct ice_sched_node *tc_node,
 	u16 i, num_groups_added = 0;
 	enum ice_status status = 0;
 	struct ice_hw *hw = pi->hw;
-	u16 buf_size;
+	size_t buf_size;
 	u32 teid;
 
-	buf_size = sizeof(*buf) + sizeof(*buf->generic) * (num_nodes - 1);
+	buf_size = struct_size(buf, generic, num_nodes - 1);
 	buf = devm_kzalloc(ice_hw_to_dev(hw), buf_size, GFP_KERNEL);
 	if (!buf)
 		return ICE_ERR_NO_MEMORY;

2.21.0

Thanks Gustavo, I will queue this up.
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