Cast to avoid warning

Adds a "(char *)" cast to avoid the warning:

debug.c: In function ‘debugCommand’:
debug.c:339:17: warning: format ‘%s’ expects argument of type ‘char *’, but argument 4 has type ‘void *’ [-Wformat=]
                 (c->argc == 3) ? "key" : c->argv[3]->ptr, j);
                 ^
debug.c:339:17: warning: format ‘%s’ expects argument of type ‘char *’, but argument 4 has type ‘void *’ [-Wformat=]

Silly merge.