[PATCH] Print "(null)" instead of passing NULL to DEBUG()

[Jeremy Allison]

On Tue, Feb 03, 2009 at 02:36:04PM -0700, Ted Percival wrote:
> 
> Probably fixes a crash during name resolution when log level >= 10
> and libc segfaults if printf is passed NULL for a "%s" arg
> (eg. Solaris).

Pushed - thanks !

Jeremy.