Update to libpng 1.2.52 (rollup change only)

third_party/libpng/pngget.c

 
 /* pngget.c - retrieval of values from info struct
  *
- * Last changed in libpng 1.2.43 [February 25, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.51 [February 6, 2014]
+ * Copyright (c) 1998-2014 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h
  *
  */
 
 #define PNG_INTERNAL
@@ skipping 870 matching lines @@
 {
     /* Obsolete, to be removed from libpng-1.4.0 */
     return (png_ptr? 0L: 0L);
 }
 
 /* This function was added to libpng 1.2.0 and should exist by default */
 png_uint_32 PNGAPI
 png_get_asm_flagmask (int flag_select)
 {
     /* Obsolete, to be removed from libpng-1.4.0 */
-    flag_select=flag_select;
+    PNG_UNUSED(flag_select)
     return 0L;
 }
 
     /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
 /* This function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_flagmask (int flag_select, int *compilerID)
 {
     /* Obsolete, to be removed from libpng-1.4.0 */
-    flag_select=flag_select;
+    PNG_UNUSED(flag_select)
     *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
     return 0L;
 }
 
 /* This function was added to libpng 1.2.0 */
 png_byte PNGAPI
 png_get_mmx_bitdepth_threshold (png_structp png_ptr)
 {
     /* Obsolete, to be removed from libpng-1.4.0 */
     return (png_ptr? 0: 0);
@@ skipping 18 matching lines @@
     return (png_ptr? png_ptr->user_width_max : 0);
 }
 png_uint_32 PNGAPI
 png_get_user_height_max (png_structp png_ptr)
 {
     return (png_ptr? png_ptr->user_height_max : 0);
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
 
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */