device/device_util.c: Fix wording in comment of `new_resource()`

Change-Id: Ieb0d5de37870a359f3a7ea1543640e26f86c1684
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/5952
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>