CVE-2013-6462: unlimited sscanf overflows stack buffer in bdfReadCharacters() from xorg/lib/libXfont http://lists.x.org/archives/xorg-announce/2014-January/002389.html

Fixes cppcheck warning:
 [lib/libXfont/src/bitmap/bdfread.c:341]: (warning)
  scanf without field width limits can crash with huge input data.