Only display minutes in the I2C error logger script.

packages/usb/log-i2c-errors.sh

@@ -4,7 +4,7 @@
 startTime=`date +%s`
 while true; do
     s="$((`date +%s`-$startTime))"
-    echo "$((s/60/60)):$((s/60)):$((s))"
+    echo "$((s/60))m"
     for i in `seq 0 5`; do ./get-slave-i2c-errors.js $i; done
 done
 ) 2>&1 | tee $1