proto_clnt: use osmo_fd_close to close the socket on connection loss

When the socket is closed due to a connection loss, we currently use
close(). This is not enough since this will not remove the file
descriptor from the select loop. Let's use osmo_fd_close.

Related: OS#5983
Change-Id: I702b944baf2ebbcc84b6a211e245a4a41627bde6
---
M src/proto_clnt.c
1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/proto_clnt.c b/src/proto_clnt.c
index 5b9a467..6c59593 100644
--- a/src/proto_clnt.c
+++ b/src/proto_clnt.c
@@ -90,8 +90,7 @@
 	msgb = osmo_e1dp_recv(ofd, NULL);
 	if (!msgb) {
 		LOGP(DE1D, LOGL_ERROR, "Lost connection with osmo-e1d control socket.\n");
-		close(ofd->fd);
-		ofd->fd = 0;
+		osmo_fd_close(&clnt->ctl_fd);
 		goto err;
 	}
 

