fixed valgrind warning in polylines

(cherry picked from commit 855765986e9cd5c730730dd1f45175b182e737fa)

diff --git a/modules/core/src/drawing.cpp b/modules/core/src/drawing.cpp
index bd42ac5..bd8f171 100644 (file)
--- a/modules/core/src/drawing.cpp
+++ b/modules/core/src/drawing.cpp
@@ -2216,6 +2216,7 @@ void cv::polylines(InputOutputArray _img, InputArrayOfArrays pts,
         Mat p = pts.getMat(manyContours ? i : -1);
         if( p.total() == 0 )
         {
+            ptsptr[i] = NULL;
             npts[i] = 0;
             continue;
         }