ashmem: use vfs_llseek()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

drivers/staging/android/ashmem.c

@@ -339,7 +339,7 @@ static loff_t ashmem_llseek(struct file *file, loff_t offset, int origin)
 		goto out;
 	}
 
-	ret = asma->file->f_op->llseek(asma->file, offset, origin);
+	ret = vfs_llseek(asma->file, offset, origin);
 	if (ret < 0)
 		goto out;