solvePnPRansac: fix mask generation

modules/calib3d/src/solvepnp.cpp

@@ -251,14 +251,10 @@ bool cv::solvePnPRansac(InputArray _opoints, InputArray _ipoints,
     if(_inliers.needed())
     {
         Mat _local_inliers;
-        int count = 0;
-        for (int i = 0; i < _mask_local_inliers.rows; ++i)
+        for (int i = 0; i < npoints; ++i)
         {
-            if((int)_mask_local_inliers.at<uchar>(i) == 1) // inliers mask
-            {
-                _local_inliers.push_back(count);    // output inliers vector
-                count++;
-            }
+            if((int)_mask_local_inliers.at<uchar>(i) != 0) // inliers mask
+                _local_inliers.push_back(i);    // output inliers vector
         }
         _local_inliers.copyTo(_inliers);
     }