Avoid warning and make local variable lower-case.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6000 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/libpng/ANNOUNCE

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+Libpng 1.6.23 - June 9, 2016
+
+This is a public release of libpng, intended for use in production codes.
+
+Files available for download:
+
+Source files with LF line endings (for Unix/Linux) and with a
+"configure" script
+
+   libpng-1.6.23.tar.xz (LZMA-compressed, recommended)
+   libpng-1.6.23.tar.gz
+
+Source files with CRLF line endings (for Windows), without the
+"configure" script
+
+   lpng1623.7z  (LZMA-compressed, recommended)
+   lpng1623.zip
+
+Other information:
+
+   libpng-1.6.23-README.txt
+   libpng-1.6.23-LICENSE.txt
+   libpng-1.6.23-*.asc (armored detached GPG signatures)
+
+Changes since the last public release (1.6.22):
+
+  Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
+  Fixed the progressive reader to handle empty first IDAT chunk properly
+    (patch by Timothy Nikkel).  This bug was introduced in libpng-1.6.0 and
+    only affected the libpng16 branch.
+  Added tests in pngvalid.c to check zero-length IDAT chunks in various
+    positions.  Fixed the sequential reader to handle these more robustly
+    (John Bowler).
+  Corrected progressive read input buffer in pngvalid.c. The previous version
+    the code invariably passed just one byte at a time to libpng.  The intent
+    was to pass a random number of bytes in the range 0..511.
+  Moved sse2 prototype from pngpriv.h to contrib/intel/intel_sse.patch.
+  Added missing ")" in pngerror.c (Matt Sarrett).
+  Fixed undefined behavior in png_push_save_buffer(). Do not call
+    memcpy() with a null source, even if count is zero (Leon Scroggins III).
+  Fixed bad link to RFC2083 in png.5 (Nikola Forro).
+
+(subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe)
+or to glennrp at users.sourceforge.net
+
+Glenn R-P