cb710: Replace zero-length array with flexible-array

There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code should
always use “flexible array members”[1] for these cases. The older style of
one-element or zero-length arrays should no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

include/linux/cb710.h

@@ -36,7 +36,7 @@ struct cb710_chip {
 	unsigned		slot_mask;
 	unsigned		slots;
 	spinlock_t		irq_lock;
-	struct cb710_slot	slot[0];
+	struct cb710_slot	slot[];
 };
 
 /* NOTE: cb710_chip.slots is modified only during device init/exit and