[ARM] omap: fix lots of 'Using plain integer as NULL pointer'

Signed-off-by: Russell King <[e-mail]>

arch/arm/mach-omap1/clock.c

···
 		return -EINVAL;
 
 	parent = clk->parent;
-	if (unlikely(parent == 0))
+	if (unlikely(parent == NULL))
 		return -EIO;
 
 	realrate = parent->rate;
···
 	if (clk->flags & ALWAYS_ENABLED)
 		return 0;
 
-	if (unlikely(clk->enable_reg == 0)) {
+	if (unlikely(clk->enable_reg == NULL)) {
 		printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 		       clk->name);
 		return -EINVAL;
···
 	__u16 regval16;
 	__u32 regval32;
 
-	if (clk->enable_reg == 0)
+	if (clk->enable_reg == NULL)
 		return;
 
 	if (clk->flags & ENABLE_REG_32BIT) {
···
 		return clk->parent->rate / (1 << dsor_exp);
 	}
 
-	if(clk->round_rate != 0)
+	if (clk->round_rate != NULL)
 		return clk->round_rate(clk, rate);
 
 	return clk->rate;

arch/arm/mach-omap2/clock.c

···
 	if (clk->enable)
 		return clk->enable(clk);
 
-	if (unlikely(clk->enable_reg == 0)) {
+	if (unlikely(clk->enable_reg == NULL)) {
 		printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 		       clk->name);
 		return 0; /* REVISIT: -EINVAL */
···
 		return;
 	}
 
-	if (clk->enable_reg == 0) {
+	if (clk->enable_reg == NULL) {
 		/*
 		 * 'Independent' here refers to a clock which is not
 		 * controlled by its parent.
···
 /* Given a clock and a rate apply a clock specific rounding function */
 long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
 {
-	if (clk->round_rate != 0)
+	if (clk->round_rate != NULL)
 		return clk->round_rate(clk, rate);
 
 	if (clk->flags & RATE_FIXED)
···
  */
 void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
 {
-	if (unlikely((clk->clksel_reg == 0) || (clk->clksel_mask == 0)))
+	if (unlikely((clk->clksel_reg == NULL) || (clk->clksel_mask == NULL)))
 		return NULL;
 
 	*field_mask = clk->clksel_mask;
···
 	void __iomem *div_addr;
 
 	div_addr = omap2_get_clksel(clk, &field_mask);
-	if (div_addr == 0)
+	if (div_addr == NULL)
 		return 0;
 
 	field_val = __raw_readl(div_addr) & field_mask;
···
 		return -EINVAL;
 
 	div_addr = omap2_get_clksel(clk, &field_mask);
-	if (div_addr == 0)
+	if (div_addr == NULL)
 		return -EINVAL;
 
 	field_val = omap2_divisor_to_clksel(clk, new_div);
···
 		return -EINVAL;
 
 	/* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
-	if (clk->set_rate != 0)
+	if (clk->set_rate != NULL)
 		ret = clk->set_rate(clk, rate);
 
 	if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
···
 	const struct clksel_rate *clkr;
 
 	*parent_div = 0;
-	*src_addr = 0;
+	*src_addr = NULL;
 
 	clks = omap2_get_clksel_by_parent(clk, src_clk);
 	if (clks == NULL)
···
 
 	field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
 					       &field_mask, clk, &parent_div);
-	if (src_addr == 0)
+	if (src_addr == NULL)
 		return -EINVAL;
 
 	if (clk->usecount > 0)

arch/arm/mach-omap2/serial.c

···
 		struct plat_serial8250_port *p = serial_platform_data + i;
 
 		if (!(info->enabled_uarts & (1 << i))) {
-			p->membase = 0;
+			p->membase = NULL;
 			p->mapbase = 0;
 			continue;
 		}

arch/arm/plat-omap/dma.c

···
 	/* request and reserve DMA channels for the chain */
 	for (i = 0; i < no_of_chans; i++) {
 		err = omap_request_dma(dev_id, dev_name,
-					callback, 0, &channels[i]);
+					callback, NULL, &channels[i]);
 		if (err < 0) {
 			int j;
 			for (j = 0; j < i; j++)

drivers/video/omap/omapfb_main.c

···
 	int ret;
 
 	omapfb_rqueue_lock(plane->fbdev);
-	ret = omapfb_update_window_async(fbi, win, NULL, 0);
+	ret = omapfb_update_window_async(fbi, win, NULL, NULL);
 	omapfb_rqueue_unlock(plane->fbdev);
 
 	return ret;
···
 	win.format = 0;
 
 	omapfb_rqueue_lock(fbdev);
-	r = fbdev->ctrl->update_window(fbi, &win, NULL, 0);
+	r = fbdev->ctrl->update_window(fbi, &win, NULL, NULL);
 	omapfb_rqueue_unlock(fbdev);
 
 	return r;
···
 		win.height = 2;
 		win.out_width = 2;
 		win.out_height = 2;
-		fbdev->ctrl->update_window(fbdev->fb_info[0], &win, NULL, 0);
+		fbdev->ctrl->update_window(fbdev->fb_info[0], &win, NULL, NULL);
 	}
 	omapfb_rqueue_unlock(fbdev);
 }