CI: Make bashate happy

Bashate warned on init-swift.sh because of E043 -- arithmetic
compound has inconsistent return semantics: (( next_port++ ))
New Zuul reported that on every change as a warning.
This is fixed here.

This change makes Bashate always produce errors so that we do not
introduce such warnings again.

Change-Id: I40166b377ec2580e17901375b636183bca492d3a

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/init-swift.sh b/tests/init-swift.sh
index f0e8bcd4d..c5cfb2856 100755
--- a/tests/init-swift.sh
+++ b/tests/init-swift.sh
@@ -44,7 +44,7 @@ function init_swift_logged {
             /etc/kolla/config/swift/$ring.builder
 
         # next ring = next port
-        (( next_port++ ))
+        next_port=$((next_port+1))
     done
 }