[PATCH RFC 1/5] fix build errors with gcc6

[Guido Trentalancia]

The following (RFC) patch aims to fix a build error when using gcc6:

/home/guido/new/jdk8u60/mercurial-rep/tmp/jdk8u/jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp: In function ‘_jobject* Java_com_sun_java_util_jar_pack_NativeUnpack_getUnusedInput(JNIEnv*, jobject)’:
/home/guido/new/jdk8u60/mercurial-rep/tmp/jdk8u/jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp:295:12: error: cannot convert ‘bool’ to ‘jobject {aka _jobject*}’ in return
     return false;
            ^~~~~

Signed-off-by: Guido Trentalancia <guido at trentalancia.net>
---
 jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- jdk8u/jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp.orig	2016-05-10 23:53:03.603809077 +0200
+++ jdk8u/jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp	2016-05-10 23:53:19.277033625 +0200
@@ -292,7 +292,7 @@ Java_com_sun_java_util_jar_pack_NativeUn
 
   if (uPtr->aborting()) {
     THROW_IOE(uPtr->get_abort_message());
-    return false;
+    return 0;
   }
 
   // We have fetched all the files.