bdiff: fix malloc(0) issue in fixws()
If fixws() is called on a zero-length string, malloc(0) is called and
expected to return a pointer. Which it does on e.g. Linux. AIX returns
NULL, which it is also legal, but the malloc() is then assumed to have
failed. So ensure a valid pointer is always returned.
$ "$TESTDIR/hghave" inotify || exit 80
$ hg init
$ touch a b c d e f
$ echo "[extensions]" >> $HGRCPATH
$ echo "inotify=" >> $HGRCPATH
inserve
$ hg inserve -d --pid-file=hg.pid 2>&1
$ cat hg.pid >> "$DAEMON_PIDS"
$ hg ci -Am m
adding a
adding b
adding c
adding d
adding e
adding f
adding hg.pid
let the daemon finish its stuff
$ sleep 1
eed to test all file opperations
$ hg rm a
$ rm b
$ echo c >> c
$ touch g
$ hg add g
$ hg mv e h
$ hg status
M c
A g
A h
R a
R e
! b
$ sleep 1
Are we able to kill the service? if not, the service died on some error
$ kill `cat hg.pid`