K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2011-05-15T07:59:33.228878Z
K 7
svn:log
V 255
Fix NF calibration breakage introduced by me in a past commit.

Since the returned NF will be -ve, checking for <= 0 is not good
enough. For now, check whether it equals 0 or -1; a future commit
will tidy this mess up and have it return HAL_BOOL instead.

END