CVE-2025-71306 ima: Fix stack-out-of-bounds in is_bprm_creds_for_exec()

In the Linux kernel, the following vulnerability has been resolved: ima: Fix stack-out-of-bounds in isbprmcredsforexec KASAN reported a stack-out-of-bounds access in imaappraisemeasurement from isbprmcredsforexec: BUG: KASAN: stack-out-of-bounds in imaappraisemeasurement+0x12dc/0x16a0 Read of siz...