sbin/hammer: check strtol()/strtoll() results to avoid irrelevant history

sbin/hammer: check strtol()/strtoll() results to avoid irrelevant history
queries

- Check errno for possible overflow/underflow by strtol()/strtoll() in
  order to avoid ioctl with irrelevant offset/length.

- Examples
  # hammer -vvv history@11111111111111111111111111111111,111 ./out
  Result too large: @11111111111111111111111111111111
  # hammer -vvv history@111,11111111111111111111111111111111 ./out
  Result too large: ,11111111111111111111111111111111
  # hammer -vvv history@-11111111111111111111111111111111,111 ./out
  Result too large: @-11111111111111111111111111111111
  # hammer -vvv history@111,-11111111111111111111111111111111 ./out
  Result too large: ,-11111111111111111111111111111111