[libpng15] Removed two redundant tests for unitialized row.

ANNOUNCE

 
-Libpng 1.5.6beta06 - October 12, 2011
+Libpng 1.5.6beta06 - October 13, 2011
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -68,9 +68,10 @@ Version 1.5.6beta05 [October 12, 2011]
     percentage for 16-bit and 32-bit pixels in the typical case where the
     output row buffers are appropriately aligned. The optimization was not
     previously possible because the png_struct buffer was always misaligned.
-  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6bet01.
+  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
 
-Version 1.5.6beta06 [October 12, 2011]
+Version 1.5.6beta06 [October 13, 2011]
+  Removed two redundant tests for unitialized row.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit

CHANGES

@@ -3629,9 +3629,10 @@ Version 1.5.6beta05 [October 12, 2011]
     percentage for 16-bit and 32-bit pixels in the typical case where the
     output row buffers are appropriately aligned. The optimization was not
     previously possible because the png_struct buffer was always misaligned.
-  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6bet01.
+  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
 
-Version 1.5.6beta06 [October 12, 2011]
+Version 1.5.6beta06 [October 13, 2011]
+  Removed two redundant tests for unitialized row.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

pngread.c

@@ -348,13 +348,7 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
    if (png_ptr == NULL)
       return;
 
-   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
-      png_read_start_row(png_ptr);
-
-   else
-      png_warning(png_ptr,
-          "Ignoring extra png_read_update_info() call;"
-          " row buffer not reallocated");
+   png_read_start_row(png_ptr);
 
 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
    png_read_transform_info(png_ptr, info_ptr);
@@ -374,15 +368,8 @@ png_start_read_image(png_structp png_ptr)
 {
    png_debug(1, "in png_start_read_image");
 
-   if (png_ptr == NULL)
-      return;
-
-   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
-      png_read_start_row(png_ptr);
-   else
-      png_warning(png_ptr,
-          "Ignoring extra png_start_read_image() call;"
-          " row buffer not reallocated");
+   if (png_ptr != NULL)
+     png_read_start_row(png_ptr);
 }
 #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */