[PATCH 3/6] test_sysctl: ignore diff output on verify_diff_w()

[Luis Chamberlain <mcgrof@kernel.org>]

When verify_diff_w() is used we care about the result, not
the verbose output, and although we use -q, that still
gives us a chatty message about if the files differ or not.
Since verify_diff_w() uses stdinput the chatty message says
whether or not "-" matches the target file, and this just
seems rather odd. Better to just ignore that messsage all
together, what we really care about i sthe results, the
return value and we check for that.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 tools/testing/selftests/sysctl/sysctl.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index e0c8404da6b0..f51987d0d32d 100755
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -179,7 +179,7 @@ verify()
 
 verify_diff_w()
 {
-	echo "$TEST_STR" | diff -q -w -u - $1
+	echo "$TEST_STR" | diff -q -w -u - $1 > /dev/null
 	return $?
 }
 
-- 
2.18.0