Rename the function extract() to hid_field_extract(), make it external linkage
to allow the use from other modules.
Suggested-by: NJiri Kosina <jkosina@suse.cz>
Signed-off-by: NGoffredo Baroncelli <kreijack@inwind.it>
Reviewed-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>