kill the 4th argument of __generic_file_aio_write()

It's always equal to &iocb->ki_pos, where iocb is the value of the 1st
argument.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 1037637..d2c170f 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -171,7 +171,7 @@
 	} else
 		up_write(&iinfo->i_data_sem);
 
-	retval = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
+	retval = __generic_file_aio_write(iocb, iov, nr_segs);
 	mutex_unlock(&inode->i_mutex);
 
 	if (retval > 0) {