fs: Prevent overflows when allocating memory for arrays

fs: Prevent overflows when allocating memory for arrays

Use grub_calloc() when allocating memory for arrays to ensure proper
overflow checks are in place.

The HFS+ and squash4 security vulnerabilities were reported by
Jonathan Bar Or <jonathanbaror@gmail.com>.

Fixes: CVE-2025-0678
Fixes: CVE-2025-1125
Signed-off-by: Lidong Chen <lidong.chen@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Gbp-Pq: Topic cve-2025-jan
Gbp-Pq: Name fs-Prevent-overflows-when-allocating-memory-for-arrays.patch