Update facedetect.cpp

Somebody forgot to add curly brackets

samples/ocl/facedetect.cpp

@@ -93,11 +93,12 @@ static int facedetect_one_thread(bool useCPU, double scale )
         if( image.empty() )
         {
             capture = cvCaptureFromAVI( inputName.c_str() );
-            if(!capture)
+            if(!capture){
                 cout << "Capture from AVI didn't work" << endl;
                 return EXIT_FAILURE;
             }
         }
+    }
 
     if( capture )
     {