The only part of the cve-check task which needs files is the patch
examination, and typically these patches are local so fetch isn't needed.
(From OE-Core rev: 2c9b3186d3b7c18cbea239ab9b06e85b7c243b54)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>