Update net.nim for 1.6 issue nim-lang#23956

Author: Zectbumo

lib/pure/net.nim

@@ -1313,7 +1313,7 @@ when defined(nimdoc) or (defined(posix) and not useNimNetLite):
     when not defined(nimdoc):
       var socketAddr = makeUnixAddr(path)
       if socket.fd.connect(cast[ptr SockAddr](addr socketAddr),
-          (sizeof(socketAddr.sun_family) + path.len).SockLen) != 0'i32:
+          (offsetOf(socketAddr, sun_path) + path.len + 1).SockLen) != 0'i32:
         raiseOSError(osLastError())
 
   proc bindUnix*(socket: Socket, path: string) =
@@ -1322,7 +1322,7 @@ when defined(nimdoc) or (defined(posix) and not useNimNetLite):
     when not defined(nimdoc):
       var socketAddr = makeUnixAddr(path)
       if socket.fd.bindAddr(cast[ptr SockAddr](addr socketAddr),
-          (sizeof(socketAddr.sun_family) + path.len).SockLen) != 0'i32:
+          (offsetOf(socketAddr, sun_path) + path.len + 1).SockLen) != 0'i32:
         raiseOSError(osLastError())
 
 when defineSsl: