i3c: master: Use struct_size() helper

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace the following form:

sizeof(*defslvs) + ((ndevs - 1) * sizeof(struct i3c_ccc_dev_desc))

with:

struct_size(defslvs, slaves, ndevs - 1)

This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

drivers/i3c/master.c

@@ -950,9 +950,8 @@ int i3c_master_defslvs_locked(struct i3c_master_controller *master)
 		ndevs++;
 
 	defslvs = i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR,
-					sizeof(*defslvs) +
-					((ndevs - 1) *
-					 sizeof(struct i3c_ccc_dev_desc)));
+					struct_size(defslvs, slaves,
+						    ndevs - 1));
 	if (!defslvs)
 		return -ENOMEM;