bpf: Fix WARN() in get_bpf_raw_tp_regs

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PT-2025-29005

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 6.15.0-rc5-syzkaller-00038-g707df3375124 Description: A warning was triggered in the get bpf raw tp regs function due to a potential issue with nested calls in tracepoints like trace mmap lock acquire returned...