mconsole: switch to kernel_read

Instead of playing with address limits.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

arch/um/drivers/mconsole_kern.c

···
 	}
 
 	do {
-		loff_t pos = file->f_pos;
-		mm_segment_t old_fs = get_fs();
-		set_fs(KERNEL_DS);
-		len = vfs_read(file, buf, PAGE_SIZE - 1, &pos);
-		set_fs(old_fs);
-		file->f_pos = pos;
+		len = kernel_read(file, buf, PAGE_SIZE - 1, &file->f_pos);
 		if (len < 0) {
 			mconsole_reply(req, "Read of file failed", 1, 0);
 			goto out_free;