LinuxPPS: Fixup of "implicit declaration of function `pps_dbg'" when PPS debugging messages are not selected. Signed-off-by: Rodolfo Giometti include/linux/pps.h URL: http://gitweb.enneenne.com/?p=linuxpps;a=commit;h=74c0229b241b66e3dfd62dcbee1a02137f0578ab