usbd_get_cdesc() malloc(size)/free(,size) sanity

Since we can't always rely on wTotalLength to be correct, use the variable which has been used to malloc(9) cdesc to free(9) it again, instead of freeing wTotalLength. usbd_get_cdesc() already has the feature built-in to return the length it has used to malloc(9) cdesc. OK? Index: ugen.c

pppx(4)/pipex(4): use per cpu counters with ifnet

pppac(4) uses per cpu counters for collect `ifnet' statistics, but in pipex(4) layer this `ifnet' still uses `if_data'. Also pppx(4) doesn't use per cpu counters but `if_data'. I propose to use per cpu counters for pppx(4) and pipex(4) to avoid interface statistics collecting mix. Also this will

pipex(4)/ppp{ac,x}(4): don't include "net/netisr.h"

It's not needed here. Index: sys/net/if_pppx.c === RCS file: /cvs/src/sys/net/if_pppx.c,v retrieving revision 1.102 diff -u -p -r1.102 if_pppx.c --- sys/net/if_pppx.c 27 Aug 2020 10:47:52 - 1.102 +++ sys/net/if_pppx.c 28