Remove remnants of sendfile()

There are now zero users of .sendfile() in the kernel, so kill
it from the file_operations structure and in do_sendfile().

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 894620e..4f0b3bf 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1054,7 +1054,7 @@
 };
 
 /*
- * "descriptor" for what we're up to with a read for sendfile().
+ * "descriptor" for what we're up to with a read.
  * This allows us to use the same read code yet
  * have multiple different users of the data that
  * we read from a file.
@@ -1105,7 +1105,6 @@
 	int (*aio_fsync) (struct kiocb *, int datasync);
 	int (*fasync) (int, struct file *, int);
 	int (*lock) (struct file *, int, struct file_lock *);
-	ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
 	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
 	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
 	int (*check_flags)(int);