Fix: Potential Vulnerability in Cloned Function

Fix: Potential Vulnerability in Cloned Function **Description** This PR fixes a security vulnerability in parse_eops() that was cloned from nasm but did not receive the security patch. The original issue was reported and fixed under https://github.com/netwide-assembler/nasm/commit/6ac6ac57e3d01ea8ed4ea47706eb724b59176461. This PR applies the same patch to eliminate the vulnerability. **References** https://nvd.nist.gov/vuln/detail/CVE-2020-24241 https://github.com/netwide-assembler/nasm/commit/6ac6ac57e3d01ea8ed4ea47706eb724b59176461