V4L/DVB: drivers/media: Remove unnecessary casts of private_data

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Jarod Wilson <jarod@redhat.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/mem2mem_testdev.c b/drivers/media/video/mem2mem_testdev.c
index 10ddecc..4525335 100644
--- a/drivers/media/video/mem2mem_testdev.c
+++ b/drivers/media/video/mem2mem_testdev.c
@@ -903,14 +903,14 @@
 static unsigned int m2mtest_poll(struct file *file,
 				 struct poll_table_struct *wait)
 {
-	struct m2mtest_ctx *ctx = (struct m2mtest_ctx *)file->private_data;
+	struct m2mtest_ctx *ctx = file->private_data;
 
 	return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
 }
 
 static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct m2mtest_ctx *ctx = (struct m2mtest_ctx *)file->private_data;
+	struct m2mtest_ctx *ctx = file->private_data;
 
 	return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
 }