dmsetup: return non-zero on stdio I/O error

If there is an I/O error on stdout, return a non-zero status so that udev can avoid trusting the values printed. Deeper changes to the log code are out of scope for this patch.

---
 libdm/dm-tools/dmsetup.c | 2 ++
 1 file changed, 2 insertions(+)

index d01b8f2..0449e40 100644
@@ -7491,5 +7491,7 @@ out:
 	if (_initial_timestamp)
 		dm_timestamp_destroy(_initial_timestamp);
 
+        if (fflush(stdout) || ferror(stdout))
+            return 1;
 	return (_switches[HELP_ARG] || _switches[VERSION_ARG]) ? 0 : ret;
 }

Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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