Bugfix for bug #3767

Fixed a memory leak in cap_dshow.cpp in videoInput::setVideoSettingCamera(). The leak was caused by not releasing an IBaseFilter object created in a call to getDevice(). Tho object is now properly released.

Conflicts:
	modules/highgui/src/cap_dshow.cpp

modules/videoio/src/cap_dshow.cpp

@@ -1839,6 +1839,8 @@ bool videoInput::setVideoSettingCamera(int deviceID, long Property, long lValue,
         hr = VDList[deviceID]->pVideoInputFilter->QueryInterface(IID_IAMCameraControl, (void**)&pIAMCameraControl);
         if (FAILED(hr)) {
             DebugPrintOut("Error\n");
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter->Release();
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter = NULL;
             return false;
         }
         else
@@ -1857,6 +1859,8 @@ bool videoInput::setVideoSettingCamera(int deviceID, long Property, long lValue,
                 pIAMCameraControl->Set(Property, lValue, Flags);
             }
             pIAMCameraControl->Release();
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter->Release();
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter = NULL;
             return true;
         }
     }