fixes failed strtol test - buffer size was too small since the largest string is 20 characters, so the buffer should be 21.
fixes failed strtol test - buffer size was too small since the largest string is 20 characters, so the buffer should be 21.

BrewPi/firmware,BrewPi/firmware,BrewPi/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware,glibersat/firmware,glibersat/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware