fix: probe CUDA context on correct device in set_task_pid()

[maverick123123]

Problem

set_task_pid() in src/utils.c polls NVML processes on the first physical device where nvml_to_cuda_map(i) >= 0, but the probe context is always created on hardcoded CUDA device 0 via cuDevicePrimaryCtxRetain(&pctx, 0).

When CUDA_VISIBLE_DEVICES does not start with the pod's device 0 (e.g., CVD=1 or CVD=1,0), the polled NVML device and the probe context device are different physical GPUs. getextrapid() never finds the new PID, causing a spurious "host pid is error!" and subsequent fake Device 0 OOM due to incorrect memory accounting.

Fix

Save the cudaDev found in the NVML enumeration loop and use it for both cuDevicePrimaryCtxRetain and cuDevicePrimaryCtxRelease, ensuring the probe context runs on the same device being polled.

Also guard against the case where no NVML device maps to a CUDA device (probeDev remains -1) by returning early before retaining any context.

Testing

Verified on an 8x RTX 3090 machine with all CVD combinations:

CUDA_VISIBLE_DEVICES	Before fix	After fix
0	OK	OK
1	host pid is error	OK
0,1	OK	OK
1,0	host pid is error	OK

Related

Fixes #225

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[maverick123123]

@rootsongjc ready to merge

[mesutoezdil]

/lgtm