ISA_cve_plugin: improve error handling of 'cve' searches of patch filenames
ISA_cve_plugin: improve error handling of 'cve' searches of patch filenames

Found during a source code scan for OpenXT ( http://openXT.org ).

This patch filename:
meta-selinux/recipes-security/selinux/libsemanage/libsemanage-Fix-execve-segfaults-on-Ubuntu.patch

unfortunately contains the substring 'cve' which confuses the tool
looking for CVE identifiers in patch filenames.
Ignore patches where the string parsing does not match.

Signed-off-by: Christopher Clark <92b288ff708f124106db1be7360ea774d4cfcb08@baesystems.com>

01org/meta-security-isafw