Description of problem:

GDM does not support PKCS#11 drivers that return a Slot ID of 0.  This is valid per the PKCS#11 specification.

# gdm-binary --nodaemon
PKCS11_Driver:C_GetFunctionList():5510: Called.
PKCS11_Driver:C_GetFunctionList():5594: Returning CKR_OK (0)
PKCS11_Driver:C_Initialize():2897: Called.
PKCS11_Driver:C_Initialize():2957: Returning CKR_OK (0)
PKCS11_Driver:C_GetInfo():3006: Called.
PKCS11_Driver:C_GetInfo():3034: Returning CKR_OK (0)
PKCS11_Driver:C_GetSlotList():3051: Called.
PKCS11_Driver:C_GetSlotList():3132: Found reader: Dell smart card reader keyboard 00 00
PKCS11_Driver:C_GetSlotList():3172: Returning CKR_OK (0)
PKCS11_Driver:C_GetSlotList():3051: Called.
PKCS11_Driver:C_GetSlotList():3132: Found reader: Dell smart card reader keyboard 00 00
PKCS11_Driver:C_GetSlotList():3190: Returning CKR_OK (0).  Found 1 readers.
PKCS11_Driver:C_GetSlotInfo():3202: Called.
PKCS11_Driver:C_GetSlotInfo():3267: Returning CKR_OK (0)

** (process:4880): CRITICAL **: _sc_security_token_new: assertion `slot_id >= 1' failed



Version-Release number of selected component (if applicable):


How reproducible:
100%.

Steps to Reproduce:
1. Create PKCS#11 driver that returns slots with a handle ID of 0 when asked for C_GetSlotList()
2. Configure GDM to talk to PKCS#11 Driver
3. Start GDM
  
Actual results:
gdm issues an failed assertion.

Expected results:
gdm uses the library.

Additional info:
Submitted bug to GDM, they indicated that this is a RHEL problem:
https://bugzilla.gnome.org/show_bug.cgi?id=619297