testsuite: remove forgotten debug hack

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/tar.tests b/testsuite/tar.tests
index 9ea89f1..4929f4e 100755
--- a/testsuite/tar.tests
+++ b/testsuite/tar.tests
@@ -38,7 +38,7 @@
 SKIP=
 
 testing "Two zeroed blocks is a ('truncated') empty tarball" '\
-dd if=/dev/zero bs=512 count=2 2>/dev/null | strace -o /tmp/zzz -tt -s99 tar xvf - 2>&1; echo $?
+dd if=/dev/zero bs=512 count=2 2>/dev/null | tar xvf - 2>&1; echo $?
 ' "\
 0
 " \