Allow non-LFS sendfile to work on LFS files.

But obviously only if we're not passing in any offset pointer.

This is how 2.4.x worked, and vsftpd relies on it.

Bug reported by Chris < chris@scary.beasts.org>

fs/read_write.c

@@ -635,7 +635,7 @@ asmlinkage ssize_t sys_sendfile(int out_fd, int in_fd, off_t __user *offset, siz
 		return ret;
 	}
 
-	return do_sendfile(out_fd, in_fd, NULL, count, MAX_NON_LFS);
+	return do_sendfile(out_fd, in_fd, NULL, count, 0);
 }
 
 asmlinkage ssize_t sys_sendfile64(int out_fd, int in_fd, loff_t __user *offset, size_t count)