switch simple cases of fget_light to fdget

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c
index cb2ddf1..07c9d8ab 100644
--- a/drivers/video/msm/mdp.c
+++ b/drivers/video/msm/mdp.c
@@ -257,19 +257,17 @@
 	    unsigned long *start, unsigned long *len,
 	    struct file **filep)
 {
-	int put_needed, ret = 0;
-	struct file *file;
-
-	file = fget_light(img->memory_id, &put_needed);
-	if (file == NULL)
+	int ret = 0;
+	struct fd f = fdget(img->memory_id);
+	if (f.file == NULL)
 		return -1;
 
-	if (MAJOR(file->f_dentry->d_inode->i_rdev) == FB_MAJOR) {
+	if (MAJOR(f.file->f_dentry->d_inode->i_rdev) == FB_MAJOR) {
 		*start = info->fix.smem_start;
 		*len = info->fix.smem_len;
 	} else
 		ret = -1;
-	fput_light(file, put_needed);
+	fdput(f);
 
 	return ret;
 }