fix -Wunused-[...] compiler warnings
Split off from !3 (closed)
xdpyinfo.c:148:1: warning: ‘silent_errors’ defined but not used [-Wunused-function]
148 | silent_errors(_X_UNUSED Display *dpy, _X_UNUSED XErrorEvent *ev)
xdpyinfo.c:155:14: warning: ‘old_handler’ defined but not used [-Wunused-variable]
155 | static int (*old_handler)(Display *, XErrorEvent *) = NULL;
Signed-off-by: Thomas Kuehne <thomas@kuehne.cn>
Edited by Alan Coopersmith