X11: Gracefully handle failure of clock_gettime()

As gracefully as possible given the API anyway.  I don't think this is an error
case that happens enough to really need transparent error handling, if the
clock doesn't work all is lost anyway.

Appeases cert-err33-c, which started caring about clock_gettime() in clang-tidy
19.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/x11.c b/src/x11.c
index 9583296..3cde709 100644
--- a/src/x11.c
+++ b/src/x11.c
@@ -1872,7 +1872,10 @@ double
 puglGetTime(const PuglWorld* const world)
 {
   struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
+  if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
+    return 0.0;
+  }
+
   return ((double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0) -
          world->startTime;
 }