pam test should return an int in main

pam test should return an int in main

change things so we conform with the usual prototype for main()

Reviewed-on: http://gerrit.openafs.org/2850
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 9d790e18fadc318305b58809c0715c4e07c82b85)
Change-Id: Ibfd1dd69024c00c08308d69315c6cf971a6e0932
Reviewed-on: http://gerrit.openafs.org/2929