Some minor fixes for gnokii

[Jan de Cuveland]

Hi,

I was trying to write my phonebook into my 6510 using the current CVS
version of gnokii and ran into some problems.

Now with some minor fixes everything runs fine for me. So I would like to
ask the developers to consider adding my patches to the CVS.

What do the patches do?
* The first corrects an obvious mistake (?) in gnooki.c.
* The second increases the size of a struct. This is necessary because
  otherwise gnokii segfaults with some large entries. (There is no range
  checking, so gnokii overwrites the return address -> bad!)
* The third is a patch to /common/gsm-encoding.c. The problem is, that
  mbtowc and wctomb do not work as desired with the special characters of
  a latin1 charset. Returning -1 is anyway a bad idea, since it
  effectively deletes the previous character of the string as well.
  Since I only changed the behaviour in case of error, I think these
  modifications will not break anything.

Regards,
Jan

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