tlsstream.c: warning: comparison of integer expressions of different signedness

Compiling main (b64af491) on OpenIndiana with GCC 7.5 produces the following warning:

netmgr/tlsstream.c: In function 'tls_send_outgoing':
netmgr/tlsstream.c:237:14: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
  237 |  if (pending > TLS_BUF_SIZE) {
      |              ^

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