Merge pull request #5562 from rodrigob:patch-2

modules/imgproc/src/grabcut.cpp

@@ -537,7 +537,7 @@ void cv::grabCut( InputArray _img, InputOutputArray _mask, Rect rect,
     if( img.empty() )
         CV_Error( CV_StsBadArg, "image is empty" );
     if( img.type() != CV_8UC3 )
-        CV_Error( CV_StsBadArg, "image mush have CV_8UC3 type" );
+        CV_Error( CV_StsBadArg, "image must have CV_8UC3 type" );
 
     GMM bgdGMM( bgdModel ), fgdGMM( fgdModel );
     Mat compIdxs( img.size(), CV_32SC1 );