Add CIM_NAMESPACE_SELECTOR if it's _not_ already added

Missed the 'not' operator in commit 807021b5179f60166ea04310b5a9a20b8e62be20 :-(
diff --git a/ChangeLog b/ChangeLog
index c57e3e3..d1517a5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2.6.12
+- Bugfixes
+  - fix regression introduced in 2.5.0, __cimnamespace selector
+    was not properly set in requests.
+
 2.6.11
 - Bugfixes
   - prevent double-free in error processing of events
diff --git a/VERSION.cmake b/VERSION.cmake
index 63474e9..59d0946 100644
--- a/VERSION.cmake
+++ b/VERSION.cmake
@@ -47,7 +47,7 @@
 # Package version 2.6.11
 SET(OPENWSMAN_MAJOR "2")
 SET(OPENWSMAN_MINOR "6")
-SET(OPENWSMAN_PATCH "11")
+SET(OPENWSMAN_PATCH "12")
 
 # Plugin API 2.2
 SET(OPENWSMAN_PLUGIN_API_MAJOR "2")
diff --git a/src/lib/wsman-client.c b/src/lib/wsman-client.c
index 6d340c1..bb37eae 100644
--- a/src/lib/wsman-client.c
+++ b/src/lib/wsman-client.c
@@ -210,7 +210,7 @@
 		if (options->cim_ns) {
                   /* don't add CIM_NAMESPACE_SELECTOR twice */
                   if (options->selectors && list_count(options->selectors) > 0) {
-                    if (list_find(options->selectors, CIM_NAMESPACE_SELECTOR, _list_key_compare)) {
+                    if (!list_find(options->selectors, CIM_NAMESPACE_SELECTOR, _list_key_compare)) {
                       wsman_add_selector(header, CIM_NAMESPACE_SELECTOR, options->cim_ns);
                     }
                   }