Ensure vgdb.c is warningless with -Wpointer-sign
* use normal 'char' (when possible) rather than 'unsigned char'
* fix bug in case a character val >= 128 is given in a -c command



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13098 a5019735-40e9-0310-863c-91ae7b9d1cf9
1 file changed