generic_write_checks(): drop isblk argument

all remaining callers are passing 0; some just obscure that fact.

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

fs/udf/file.c

@@ -151,7 +151,7 @@ static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	} else
 		up_write(&iinfo->i_data_sem);
 
-	retval = generic_write_checks(file, &iocb->ki_pos, &count, 0);
+	retval = generic_write_checks(file, &iocb->ki_pos, &count);
 	if (retval)
 		goto out;