[SSSD] [PATCH] pam: Bad debug message format and parameter.

[Michal Židek]

Simple patch attached.

Thanks
Michal

PS: We should really push the patches that Lukas wrote to prevent this 
kind of errors. It is in thread:
[SSSD] [PATCHES] Enable printf format string checking

With them, we will get warning if do the same mistake in the future.