V4L/DVB (6407): planb: fix obvious interrupt handling bugs

irq handlers have returned a return value for years now... catch up with
the times.

Also, ditch unneeded prototype.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/planb.c

@@ -91,7 +91,6 @@ static void planb_close(struct video_device *);
 static int planb_ioctl(struct video_device *, unsigned int, void *);
 static int planb_init_done(struct video_device *);
 static int planb_mmap(struct video_device *, const char *, unsigned long);
-static void planb_irq(int, void *);
 static void release_planb(void);
 int init_planbs(struct video_init *);
 
@@ -1315,7 +1314,7 @@ cmd_tab_data_end:
 	return c1;
 }
 
-static void planb_irq(int irq, void *dev_id)
+static irqreturn_t planb_irq(int irq, void *dev_id)
 {
 	unsigned int stat, astat;
 	struct planb *pb = (struct planb *)dev_id;
@@ -1358,13 +1357,14 @@ static void planb_irq(int irq, void *dev_id)
 		pb->frame_stat[fr] = GBUFFER_DONE;
 		pb->grabbing--;
 		wake_up_interruptible(&pb->capq);
-		return;
+		return IRQ_HANDLED;
 	}
 	/* incorrect interrupts? */
 	pb->intr_mask = PLANB_CLR_IRQ;
 	out_le32(&pb->planb_base->intr_stat, PLANB_CLR_IRQ);
 	printk(KERN_ERR "PlanB: IRQ lockup, cleared intrrupts"
 							" unconditionally\n");
+	return IRQ_HANDLED;
 }
 
 /*******************************
@@ -2090,7 +2090,7 @@ static int init_planb(struct planb *pb)
 	/* clear interrupt mask */
 	pb->intr_mask = PLANB_CLR_IRQ;
 
-	result = request_irq(pb->irq, planb_irq, 0, "PlanB", (void *)pb);
+	result = request_irq(pb->irq, planb_irq, 0, "PlanB", pb);
 	if (result < 0) {
 		if (result==-EINVAL)
 			printk(KERN_ERR "PlanB: Bad irq number (%d) "