[Bug 268223] java/openjdk8: fix build with clang 15

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268223

            Bug ID: 268223
           Summary: java/openjdk8: fix build with clang 15
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: java@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(java@FreeBSD.org)
          Assignee: java@FreeBSD.org

During an exp-run for llvm 15 (see bug 265425), it turned out that
java/openjdk8 failed to build with clang 15:

   
/wrkdirs/usr/ports/java/openjdk8/work/jdk8u-jdk8u352-b08.1/jdk/src/share/bin/splashscreen_stubs.c:64:30:
error: incompatible pointer to integer conversion returning 'void *' from a
function with result type 'int' [-Wint-conversion]
        INVOKE(SplashLoadMemory, NULL)(pdata, size);
                                 ^~~~
    /usr/include/sys/_null.h:34:14: note: expanded from macro 'NULL'
    #define NULL    ((void *)0)
                    ^~~~~~~~~~~
   
/wrkdirs/usr/ports/java/openjdk8/work/jdk8u-jdk8u352-b08.1/jdk/src/share/bin/splashscreen_stubs.c:60:39:
note: expanded from macro 'INVOKE'
    #define INVOKE(name,def) _INVOKE(name,def,return)
                                          ^~~
   
/wrkdirs/usr/ports/java/openjdk8/work/jdk8u-jdk8u352-b08.1/jdk/src/share/bin/splashscreen_stubs.c:57:25:
note: expanded from macro '_INVOKE'
        if (!proc) { return def; } \
                            ^~~
   
/wrkdirs/usr/ports/java/openjdk8/work/jdk8u-jdk8u352-b08.1/jdk/src/share/bin/splashscreen_stubs.c:68:28:
error: incompatible pointer to integer conversion returning 'void *' from a
function with result type 'int' [-Wint-conversion]
        INVOKE(SplashLoadFile, NULL)(filename);
                               ^~~~
    /usr/include/sys/_null.h:34:14: note: expanded from macro 'NULL'
    #define NULL    ((void *)0)
                    ^~~~~~~~~~~
   
/wrkdirs/usr/ports/java/openjdk8/work/jdk8u-jdk8u352-b08.1/jdk/src/share/bin/splashscreen_stubs.c:60:39:
note: expanded from macro 'INVOKE'
    #define INVOKE(name,def) _INVOKE(name,def,return)
                                          ^~~
   
/wrkdirs/usr/ports/java/openjdk8/work/jdk8u-jdk8u352-b08.1/jdk/src/share/bin/splashscreen_stubs.c:57:25:
note: expanded from macro '_INVOKE'
        if (!proc) { return def; } \
                            ^~~
    2 errors generated.

Indeed, instead of the pointer value NULL, the integer value 0 should be used.

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