[Pam-developers] Do not prompt for password in pam_get_authtok_verify if the password was verified before

This patch solves double prompt for password verification if you have stacked modules which explicitly call pam_get_authtok_verify. For example this stack of modules will trigger such behavior: pam_pwhistory.so pam_cracklib.so pam_unix.so Please review, -- Tomáš Mráz No matter how far down the wrong road you've gone, turn back. Turkish proverb [You'll know whether the road is wrong if you carefully listen to your conscience.]