test/boot_switch: fix out of bound read #1415
Merged
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g_bytes_unref_to_data doesn't provide a null-terminated string, so json_from_string might read beyond the end of the subprocess output. Instead of adding a null-byte ourselves, switch to g_subprocess_communicate_utf8.
This is a better fit, as json_from_string expects a valid UTF-8 string anyway.
Fixes: #1414