followup for 89b0d5cb, backport 8c422bf4

scripts/wsrep_sst_common.sh

@@ -126,9 +126,9 @@ done
 readonly WSREP_SST_OPT_BYPASS
 readonly WSREP_SST_OPT_BINLOG
 
-if [ -n "${WSREP_SST_OPT_ADDR_PORT:-}" ]; then
+if [ -n "${WSREP_SST_OPT_ADDR:-}" ]; then
   if [ -n "${WSREP_SST_OPT_PORT:-}" ]; then
-    if [ "$WSREP_SST_OPT_PORT" != "$WSREP_SST_OPT_ADDR_PORT" ]; then
+    if [ -n "$WSREP_SST_OPT_ADDR_PORT" -a "$WSREP_SST_OPT_PORT" != "$WSREP_SST_OPT_ADDR_PORT" ]; then
       wsrep_log_error "port in --port=$WSREP_SST_OPT_PORT differs from port in --address=$WSREP_SST_OPT_ADDR"
       exit 2
     fi