f2fs: print kernel message if filesystem is inconsistent

As Pavel reported, once we detect filesystem inconsistency in
f2fs_inplace_write_data(), it will be better to print kernel message as
we did in other places.
Reported-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Acked-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -3242,6 +3242,8 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
 
 	if (!IS_DATASEG(get_seg_entry(sbi, segno)->type)) {
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
+		f2fs_warn(sbi, "%s: incorrect segment(%u) type, run fsck to fix.",
+			  __func__, segno);
 		return -EFAULT;
 	}