lupdate segfault on \0 in Java

The 'lupdate' tool has a segmentation fault when encountering \0 in Java code.

I'm not 100% sure whether "\0" is legal Java, but javac doesn't complain about it. In any case, lupdate shouldn't segfault (I had to do a sort of binary search to work out what was going on).

Test case:

$ cat nullChar.java
class X{
static void main(String[] args)

}
$ lupdate nullChar.java -ts nullChar.ts
Segmentation fault