[media] media: davinci: vpif: fix array out of bound warnings

This patch fixes following array out of bound warnings,

drivers/media/platform/davinci/vpif_display.c: In function 'vpif_remove':
drivers/media/platform/davinci/vpif_display.c:1389:36: warning: iteration
1u invokes undefined behavior [-Waggressive-loop-optimizations]
   vb2_dma_contig_cleanup_ctx(common->alloc_ctx);
                                    ^
drivers/media/platform/davinci/vpif_display.c:1385:2: note: containing loop
  for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
  ^
drivers/media/platform/davinci/vpif_capture.c: In function 'vpif_remove':
drivers/media/platform/davinci/vpif_capture.c:1581:36: warning: iteration
1u invokes undefined behavior [-Waggressive-loop-optimizations]
   vb2_dma_contig_cleanup_ctx(common->alloc_ctx);
                                    ^
drivers/media/platform/davinci/vpif_capture.c:1577:2: note: containing loop
  for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
  ^
drivers/media/platform/davinci/vpif_capture.c:1580:23: warning: array subscript
is above array bounds [-Warray-bounds]
   common = &ch->common[i];
Reported-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/davinci/vpif_capture.c

@@ -1577,7 +1577,7 @@ static int vpif_remove(struct platform_device *device)
 	for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
 		/* Get the pointer to the channel object */
 		ch = vpif_obj.dev[i];
-		common = &ch->common[i];
+		common = &ch->common[VPIF_VIDEO_INDEX];
 		vb2_dma_contig_cleanup_ctx(common->alloc_ctx);
 		/* Unregister video device */
 		video_unregister_device(ch->video_dev);

drivers/media/platform/davinci/vpif_display.c

@@ -1385,7 +1385,7 @@ static int vpif_remove(struct platform_device *device)
 	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
 		/* Get the pointer to the channel object */
 		ch = vpif_obj.dev[i];
-		common = &ch->common[i];
+		common = &ch->common[VPIF_VIDEO_INDEX];
 		vb2_dma_contig_cleanup_ctx(common->alloc_ctx);
 		/* Unregister video device */
 		video_unregister_device(ch->video_dev);