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Do not ignore return value of ftruncate(): testcases are compiled with -Werror,
and ftruncate is declared with attribute warn_unused_result.
--- harness/cases/8.t.orig	2012-03-09 16:40:04.074168070 +0100
+++ harness/cases/8.t	2012-03-09 16:40:57.777278646 +0100
@@ -9,12 +9,13 @@
 {
 	long long min = 0, max = 9223372036854775807LL;
 	char c = 0;
+	int ret;
 
 	while (max - min > 1) {
 		if (pwrite64(fd, &c, 1, (min + max) / 2) == -1)
 			max = (min + max) / 2;
 		else {
-			ftruncate(fd, 0);
+			ret = ftruncate(fd, 0);		assert(ret == 0);
 			min = (min + max) / 2;
 		}
 	}