fix error in timer.c
fix error in timer.c

inspiredengineering/canfestival3,chrta/canfestival-3-ct,inspiredengineering/canfestival3,inspiredengineering/canfestival3,inspiredengineering/canfestival3,chrta/canfestival-3-ct,chrta/canfestival-3-ct,chrta/canfestival-3-ct,inspiredengineering/canfestival3,chrta/canfestival-3-ct