Fix typo in chansrv_fuse.c

The code as it stands is checking two file descriptors for possible
input, but only one needs to be checked.

sesman/chansrv/chansrv_fuse.c

@@ -675,7 +675,7 @@ int xfuse_check_wait_objs(void)
         return 0;
     }
 
-    if (g_tcp_select(g_fd, 0) & 1)
+    if (g_sck_can_recv(g_fd, 0))
     {
         tmpch = g_ch;