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build-aux,codegen: always fully clear fixed size array

Aleksander Morgado requested to merge aleksm/libqmi:aleksander/fix-stack-read into main

We don't know how many valid bytes will be read in the qmi_message_tlv_read_fixed_size_string() call, so ensure the target array is completely cleared in case we read less than expected.

E.g. for a 2 digit MNC field reported in the LTE System Info TLV, we would find a 3 byte array containing the last byte as 0xFF. In this case, the 3rd byte won't be set in the target array as it wouldn't be valid UTF-8.

Fixes #97 (closed)

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