[opencv] 91/98: Restore 2.4 source branch for bug fix 6317.

[Mattia Rizzolo]

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mattia pushed a commit to annotated tag 2.4.13
in repository opencv.

commit db0ae2ca5030c03b2b1c331efc314ff1a5e3e1aa
Author: Kevin, Hu <huzq85 at gmail.com>
Date:   Tue Apr 19 19:27:42 2016 +0800

    Restore 2.4 source branch for bug fix 6317.
---
 modules/highgui/src/grfmt_png.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/modules/highgui/src/grfmt_png.cpp b/modules/highgui/src/grfmt_png.cpp
index bbbfb94..22160a9 100644
--- a/modules/highgui/src/grfmt_png.cpp
+++ b/modules/highgui/src/grfmt_png.cpp
@@ -228,8 +228,6 @@ bool  PngDecoder::readData( Mat& img )
     AutoBuffer<uchar*> _buffer(m_height);
     uchar** buffer = _buffer;
     int color = img.channels() > 1;
-    uchar* data = img.data;
-    int step = (int)img.step;
 
     if( m_png_ptr && m_info_ptr && m_end_info && m_width && m_height )
     {
@@ -281,7 +279,7 @@ bool  PngDecoder::readData( Mat& img )
             png_read_update_info( png_ptr, info_ptr );
 
             for( y = 0; y < m_height; y++ )
-                buffer[y] = data + y*step;
+                buffer[y] = img.data + y*img.step;
 
             png_read_image( png_ptr, buffer );
             png_read_end( png_ptr, end_info );

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