genirq/irq_sim: Remove unused irq_sim_work_ctx:: Irq_base

Since commit 337cbeb ("genirq/irq_sim: Simplify the API"),
irq_sim_work_ctx::irq_base is unused. Drop it.

Found by https://github.com/jirislaby/clang-struct.

Signed-off-by: Jiri Slaby (SUSE) <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Bartosz Golaszewski <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

Author: Jiri Slaby (SUSE)

kernel/irq/irq_sim.c

@@ -13,7 +13,6 @@
 
 struct irq_sim_work_ctx {
 	struct irq_work		work;
-	int			irq_base;
 	unsigned int		irq_count;
 	unsigned long		*pending;
 	struct irq_domain	*domain;