posix: Fix return-value of mknod() and c-include for tcgetsid()
posix: Fix return-value of mknod() and c-include for tcgetsid()

Introduced with 535f2734d19875ccc1f170841b72eba0c4adad1e

GNOME/vala,GNOME/vala,frida/vala,GNOME/vala,frida/vala,frida/vala,frida/vala,GNOME/vala,frida/vala