Description of Problem:
groff terminates with an error when trying to generate  Japanese html

Version-Release number of selected component (if applicable):
1.17.2-5

How Reproducible:
always

Steps to Reproduce:
1. gzip -dc /usr/share/man/ja/man1/ls.1.gz | LANG=ja_JP.eucJP groff -mandoc
-Thtml

Actual Results:
<standard input>:21: warning: can't break line
<standard input>:28: warning: can't break line
<standard input>:29: warning: can't break line
<standard input>:30: warning: can't break line
<standard input>:302: warning: can't break line
<standard input>:302: warning: can't break line
<standard input>:379: warning: can't break line
<standard input>:379: warning: can't break line
<standard input>:418: warning: can't break line
<standard input>:418: warning: can't break line
<standard input>:445: warning: can't break line
<standard input>:445: warning: can't break line
<standard input>:36: warning: can't break line
post-grohtml:/usr/share/groff/site-tmac/man.local:580:fatal error: need to
increase char_block::SIZE

Expected Results:
no error

Additional Information:
In C locale there is no error, but of course the output is garbage.