A value assigned to a variable is never used.

Defect 76552 (STATIC_C)
Checker UNUSED_VALUE (subcategory none)
File: /src/mongoc/mongoc-socket.c
Function _mongoc_socket_try_sendv
/src/mongoc/mongoc-socket.c, line: 1014
Overwriting previous write to "ret" with value from "sendmsg(sock->sd, &msg, MSG_NOSIGNAL)".

       ret = sendmsg (sock->sd, &msg,

/src/mongoc/mongoc-socket.c, line: 995
Assigning value "-1L" to "ret" here, but that stored value is overwritten before it can be used.

       ssize_t ret = -1;