[MPlayer-dev-eng] Fix crash with sami subtitles

[J. Grant]

Hi Adlan,

Thanks for spotting the problem.

I tried with Adventure.ttf but got this error:

==============================================
subtitle font: prepare_charset failed.
Unicode charmap not available for this font. Very bad!8% 26%  2.3% 4 0 0%
subtitle font: prepare_charset failed.
==============================================

I then tried with Bluehigh.ttf, this worked ok ;)

Thanks for your help!  Also thank you Salvatore Falco for your email.

Kind regards

JG