runtests.pl: fix "uninitialized value" warning

follow-up to e12825c642a88774

diff --git a/tests/runtests.pl b/tests/runtests.pl
index 24e65e7cd3e5959a985e5be6d7cab89a4d102e17..92ff1f61d86f7066293870605c1f03c25cb34f87 100755 (executable)
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -3593,7 +3593,7 @@ sub singletest {
                 $cond = $1;
                 $rev = 1;
             }
-            $rev ^= $feature{$cond};
+            $rev ^= $feature{$cond} ? 1 : 0;
             $show = $rev;
             next;
         }