CppCheck cleaning : redundant checking of elemet existence

Change-Id: I141b488b0067f8c6eaa54bdc9d42b4a44cfe3907
Reviewed-on: https://gerrit.libreoffice.org/14849Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

sw/source/uibase/app/swwait.cxx

@@ -70,9 +70,8 @@ void SwWait::LeaveWaitAndUnlockDispatcher()
         {
             // only unlock dispatchers which had been locked
             SfxDispatcher* pDispatcher = pFrame->GetDispatcher();
-            if ( mpLockedDispatchers.find( pDispatcher ) != mpLockedDispatchers.end() )
+            if ( mpLockedDispatchers.erase( pDispatcher ) )
             {
-                mpLockedDispatchers.erase( pDispatcher );
                 pDispatcher->Lock( false );
             }
         }