RFR(XS): 8220072: GCC 8.3 reports errors in java.base

[Dmitry Chuyko]

Hello,

Please review a small fix for compilation error reported by recent compiler in canonicalize() from canonicalize_md.c. PATH_MAX may be passed as num argument to strncpy() and ‘\0’ is added to resulting string. The case of too long name is processed at the beginning of canonicalize() so duplicate check is removed.

bug: https://bugs.openjdk.java.net/browse/JDK-8220072 <https://bugs.openjdk.java.net/browse/JDK-8220072>
webrev: http://cr.openjdk.java.net/~dchuyko/8220072/webrev.01/ <http://cr.openjdk.java.net/~dchuyko/8220072/webrev.01/>
testing: dev-submit mach5-one-dchuyko-JDK-8220072-1-20190521-1536-2605973: PASSED

-Dmitry