utils: fix nl_msec2str() which always returned '0msec' for whole second durations
utils: fix nl_msec2str() which always returned '0msec' for whole second durations

If the duration was without subsecond part, the function always returned
'0msec', instead of giving the time in days, hours, minutes or seconds.

Regression introduced by commit b3fb89f445108677d405c62865b25aeea209d10a.

Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>
Acked-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>

dsahern/libnl,HolyShitMan/libnl-1,greearb/libnl-ct,kolyshkin/libnl,vyos/libnl3,houstar/libnl,mshirley/libnl,mshirley/libnl,UnicronNL/libnl3,tklauser/libnl,mshirley/libnl,tklauser/libnl,congwang/libnl,claudelee/libnl,tgraf/libnl,greearb/libnl-ct,vyos/libnl3,honsys/libnl,baloo/libnl,tgraf/libnl,UnicronNL/libnl3,HolyShitMan/libnl-1,greearb/libnl-ct,congwang/libnl,kolyshkin/libnl,vyos/libnl3,baloo/libnl,tklauser/libnl,baloo/libnl,kolyshkin/libnl,claudelee/libnl,honsys/libnl,UnicronNL/libnl3,thom311/libnl,mshirley/libnl,thom311/libnl,thom311/libnl,claudelee/libnl,houstar/libnl,cfriedt/libnl,houstar/libnl,cyclops8456/libnl3,HolyShitMan/libnl-1,cfriedt/libnl,dsahern/libnl,tgraf/libnl,HolyShitMan/libnl-1,vyos/libnl3,cyclops8456/libnl3,cyclops8456/libnl3,tgraf/libnl,kolyshkin/libnl,UnicronNL/libnl3,congwang/libnl,tklauser/libnl,congwang/libnl,honsys/libnl,cfriedt/libnl,honsys/libnl,dsahern/libnl,cyclops8456/libnl3,cfriedt/libnl,dsahern/libnl,houstar/libnl,baloo/libnl,claudelee/libnl