nvramtool: Close file after use

mmap builds a new reference to the file, so the file
descriptor isn't necessary anymore. Close it.

Change-Id: I639fd13ff8f13cbdfce1d199d75744e56f2b19b3
Found-by: Coverity Scan
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/6475
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

0 files changed, 0 insertions, 0 deletions