gawk: do_match() invalid read

[Dmitry V. Levin]

Hi,

Due to missing mounds check, do_match() may do invalid read in multibyte
locales:

$ printf '\n\n' |env -i gawk '{print match(""," *")}'
1
1
$ printf '\n\n' |env -i LC_ALL=ru_RU.UTF-8 gawk '{print match(""," *")}'
-1208299079
134843273

As you see, match() output in multibyte locale is wrong; valgrind reports
about "Invalid read of size 4".  

Proposed fix is attached.


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ldv

gawk-3.1.5-alt-do_match.diff
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