tests: replace write by xwrite

Using write without cheks leads to warn unused result when __wur is
enabled.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/libio/bug-ungetc.c b/libio/bug-ungetc.c
index 51940b68f5..4ea2d14ed6 100644
--- a/libio/bug-ungetc.c
+++ b/libio/bug-ungetc.c
@@ -2,6 +2,8 @@
 
 #include <stdio.h>
 
+#include <support/xunistd.h>
+
 static void do_prepare (void);
 #define PREPARE(argc, argv) do_prepare ()
 static int do_test (void);
@@ -20,7 +22,7 @@ do_prepare (void)
       printf ("cannot create temporary file: %m\n");
       exit (1);
     }
-  write (fd, pattern, sizeof (pattern));
+  xwrite (fd, pattern, sizeof (pattern));
   close (fd);
 }