mbedtls: fix potential use of uninitialized nread
#19393
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When Curl_conn_cf_recv() returns error, the variable might not be assigned and the tracing output may (harmlessly) use it uninitialized. Also add a comment about the typecast from size_t to int being fine. Pointed out by ZeroPath
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When Curl_conn_cf_recv() returns error, the variable might not be assigned and the tracing output may (harmlessly) use it uninitialized.
Also add a comment about the typecast from size_t to int being fine.
Pointed out by ZeroPath