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--- a/hsr-outputs.c
+++ b/hsr-outputs.c
@@ -47,7 +47,11 @@
int
main(int argc, char **argv)
{
- Display *display = XOpenDisplay(NULL);
+ Display *display;
+ if (!(display = XOpenDisplay(NULL))) {
+ fprintf(stderr, "Cannot open X display!\n");
+ exit(123);
+ }
enum Format format = TEXT;
void (*print)(XineramaScreenInfo*) = print_text;
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