utils: Fix Kata tar archive check
The static tar archive published on GitHub (now) contains `./` which is
being being flagged as an "unknown path" and resulting in the
`kata-manager.sh` script failing.
Partially fixes:
@@ -473,7 +473,7 @@ install_kata()
# Since we're unpacking to the root directory, perform a sanity check
# on the archive first.
local unexpected=$(tar -tf "${file}" |\
- egrep -v "^(\./opt/$|\.${kata_install_dir}/)" || true)
+ egrep -v "^(\./$|\./opt/$|\.${kata_install_dir}/)" || true)
[ -n "$unexpected" ] && die "File '$file' contains unexpected paths: '$unexpected'"
