Initialize variable that can potentially be used uninitialized

Initialize variable that can potentially be used uninitialized

Some compiler versions complain that "code" might be used uninitialized
here.  If opening the configuration files fails, conf would be null
and the condition would indeed test an uninitialized variable.

Change-Id: I1d4da49a5afc94ac6617201110be84a0e5548f38
Reviewed-on: http://gerrit.openafs.org/1306
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>