Bug Report: Uninitialized Buffer res in rpc_iwinfo_scan() May Cause Garbage Data

[limao-cpu]

In the rpc_iwinfo_scan() function of rpcd, the local buffer res is defined but not explicitly initialized:
char res[IWINFO_BUFSIZE];
This buffer is reused multiple times during the scan process. Without proper initialization (e.g., memset), this may lead to garbage data or leftover content from previous iterations, especially if the content length varies across calls.

[limao-cpu]

Steps to Reproduce

1. Call rpc_iwinfo_scan() multiple times or iterate over several interfaces during one invocation.
2. Observe the output (e.g., MAC addresses, SSIDs) from the res buffer.
3. You may notice invalid characters or leftover content when the current write is shorter than the previous one.

Additional Information
Let me know if a patch would be helpful — I'm happy to submit one. Thanks for maintaining this project!