Make the return code match the naughty exit.

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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271592 13f79535-47bb-0310-9956-ffa450edef68

src/script/ant

@@ -77,7 +77,7 @@ fi
 if [ ! -x "$JAVACMD" ] ; then
   echo "Error: JAVA_HOME is not defined correctly."
   echo "  We cannot execute $JAVACMD"
-  exit
+  exit 1
 fi
 
 if [ -n "$CLASSPATH" ] ; then