/usr/bin/who performs no error checking [patch]

["Douwe Kiela" <virtus@xxxxxxxxxx>]

Hello,

/usr/bin/who performs no error checking on the stat() call, while
it should error out when a utmp file can not be accessed. Here is
a simple patch:

http://virtus.ath.cx/dfbsd/who.c.diff

Regards,
Douwe