RFR: JDK-8152352 Compiling warnings in zip_util.c blocks devkit to build with --with-zlib=system

[Xueming Shen]

Hi,

Please help review the change to remove two compiling warnings in zip_util.c

issue: https://bugs.openjdk.java.net/browse/JDK-8152352
webrev: http://cr.openjdk.java.net/~sherman/8152352/webrev/

thanks,
Sherman