Description of problem
lnstat fills the output with headers ignoring switch to 
minimise the headers printed.

"-s 0" works fine, but "-s 1" and "-s 2" fail, because the header line is printing during each interval instead of once for "-s 1" or every 20 lines for "-s 2".

Version-Release number of selected component (if applicable):
 iproute-3.10.0-54.el7.x86_64.rpm 

How reproducible:
Always


Steps to Reproduce:
1.lnstat -s 1


Actual results:
Prints header on every interval


Expected results:
Should print header only once

Additional info:
Relevant patch

http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/misc/lnstat.c?id=fdb347f7fd6c36b270a8c571cbe9a124a281b2b5