MFC r245266:
Remove not very useful printf, that can be too chatty.

ASUS P8Z77-V board reports _AC2, _AC3 and _AC4 setpoints as 0C.  With active
cooling already automatically set to _AC2, that still caused driver to print
two useless lines about temperature above _AC3 and _AC4 every ten seconds.
Three setponts of 0C is probably a board bug, but the same spam could happen
also in correct case if system is runnign not with the lowest cooling level.