Slight cleanup improvement on a previous commit.

Author: ayurchen

scripts/wsrep_sst_common.sh

@@ -143,8 +143,8 @@ readonly WSREP_SST_OPT_AUTH
 if ! wsrep_auth_not_set
 then
     readonly AUTH_VEC=(${WSREP_SST_OPT_AUTH//:/ })
-    [ -n "${AUTH_VEC[0]}" ] && WSREP_SST_OPT_USER="${AUTH_VEC[0]}"
-    [ -n "${AUTH_VEC[1]:-}" ] && WSREP_SST_OPT_PSWD="${AUTH_VEC[1]:-}"
+    WSREP_SST_OPT_USER="${AUTH_VEC[0]:-}"
+    WSREP_SST_OPT_PSWD="${AUTH_VEC[1]:-}"
 fi
 readonly WSREP_SST_OPT_USER
 readonly WSREP_SST_OPT_PSWD