* strace.c (maybe_allocate_tcb): Replace "(char *) 0" with NULL as ptrace's third argument. * linux/sparc64/get_scno.c (arch_get_scno): Cast third argument of ptrace to "void *'. * syscall.c (get_regs): Likewise. * upeek.c (upeek): Likewise. * util.c (umoven): Likewise.