Make sure error output from errors.sh can be seen

This is to make it possible to use valgrind output.
diff --git a/tests/errors.sh b/tests/errors.sh
index e553622..0ac6899 100755
--- a/tests/errors.sh
+++ b/tests/errors.sh
@@ -30,7 +30,7 @@
 
 	while read -r line; do
 
-		echo "$line" | "$bc" "$@" "$options" > /dev/null 2>&1
+		echo "$line" | "$bc" "$@" "$options" > /dev/null
 		error="$?"
 
 		if [ "$error" -eq 0 ]; then