[libpng16] Reverted new test on unknown chunk location; it was bogus.

ANNOUNCE

-Libpng 1.6.17rc02 - March 7, 2015
+Libpng 1.6.17rc02 - March 8, 2015
 
 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.
@@ -68,11 +68,9 @@ Version 1.6.17beta06 [February 27, 2015]
 Version 1.6.17rc01 [March 4, 2015]
   No changes.
 
-Version 1.6.17rc02 [March 7, 2015]
+Version 1.6.17rc02 [March 8, 2015]
   Removed some comments that the configure script did not handle
     properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
-  Stopped a potential memory leak in png_set_unknown_chunks(). Breaks
-    tests/pngunknown-sAPI so it's temporarily marked SKIP.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CHANGES

@@ -5169,11 +5169,9 @@ Version 1.6.17beta06 [February 27, 2015]
 Version 1.6.17rc01 [March 4, 2015]
   No changes.
 
-Version 1.6.17rc02 [March 7, 2015]
+Version 1.6.17rc02 [March 8, 2015]
   Removed some comments that the configure script did not handle
     properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
-  Stopped a potential memory leak in png_set_unknown_chunks(). Breaks
-    tests/pngunknown-sAPI so it's temporarily marked SKIP.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

pngset.c

@@ -1180,17 +1180,6 @@ png_set_unknown_chunks(png_const_structrp png_ptr,
       return;
    }
 
-   if ((np->location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
-   {
-      png_free(png_ptr, np);
-      np = NULL;
-      png_chunk_report(png_ptr,
-          "invalid chunk location in png_set_unknown_chunks",
-          PNG_CHUNK_WRITE_ERROR);
-
-      return;
-   }
-
    png_free(png_ptr, info_ptr->unknown_chunks);
    info_ptr->unknown_chunks = np; /* safe because it is initialized */
    info_ptr->free_me |= PNG_FREE_UNKN;
@@ -1267,7 +1256,6 @@ png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
 }
 #endif /* STORE_UNKNOWN_CHUNKS */
 
-
 #ifdef PNG_MNG_FEATURES_SUPPORTED
 png_uint_32 PNGAPI
 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)

tests/pngunknown-sAPI

 #!/bin/sh
-code=77 # skipped
-exit 77
 exec ./pngunknown bKGD=save cHRM=save gAMA=save all=discard iCCP=save sBIT=save sRGB=save "${srcdir}/pngtest.png"