staging: dt3155v4l: remove irq_handler from struct dt3155_priv

There is no reason to cache the irq_handler in struct dt3155_priv.  Just pass
the function directly in request_irq.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/dt3155v4l/dt3155v4l.c

@@ -406,8 +406,7 @@ dt3155_open(struct file *filp)
 		/* disable all irqs, clear all irq flags */
 		iowrite32(FLD_START | FLD_END_EVEN | FLD_END_ODD,
 						pd->regs + INT_CSR);
-		pd->irq_handler = dt3155_irq_handler_even;
-		ret = request_irq(pd->pdev->irq, pd->irq_handler,
+		ret = request_irq(pd->pdev->irq, dt3155_irq_handler_even,
 						IRQF_SHARED, DT3155_NAME, pd);
 		if (ret)
 			goto err_request_irq;

drivers/staging/dt3155v4l/dt3155v4l.h

@@ -183,7 +183,6 @@ struct dt3155_stats {
  * @q			pointer to vb2_queue structure
  * @curr_buf:		pointer to curren buffer
  * @mux:		mutex to protect the instance
- * @irq_handler:	irq handler for the driver
  * @dmaq		queue for dma buffers
  * @lock		spinlock for dma queue
  * @field_count		fields counter
@@ -199,7 +198,6 @@ struct dt3155_priv {
 	struct vb2_queue *q;
 	struct vb2_buffer *curr_buf;
 	struct mutex mux;
-	irq_handler_t irq_handler;
 	struct list_head dmaq;
 	spinlock_t lock;
 	unsigned int field_count;