Use osmo_fd_*_{disable,enable}

Change-Id: I16563a1033ad12a32104bfee974045ac4302bc74
Depends: libosmocore.git Idb89ba7bc7c129a6304a76900d17f47daf54d17d
diff --git a/src/osmobts_sock.cpp b/src/osmobts_sock.cpp
index c9beff0..522581a 100644
--- a/src/osmobts_sock.cpp
+++ b/src/osmobts_sock.cpp
@@ -82,7 +82,7 @@
 		return -EIO;
 	}
 	msgb_enqueue(&pcu_sock_state.upqueue, msg);
-	conn_bfd->when |= OSMO_FD_WRITE;
+	osmo_fd_write_enable(conn_bfd);
 
 	return 0;
 }
@@ -153,7 +153,7 @@
 		msg = llist_entry(pcu_sock_state.upqueue.next, struct msgb, list);
 		pcu_prim = (struct gsm_pcu_if *)msg->data;
 
-		bfd->when &= ~OSMO_FD_WRITE;
+		osmo_fd_write_disable(bfd);
 
 		/* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
 		if (!msgb_length(msg)) {
@@ -168,7 +168,7 @@
 			goto close;
 		if (rc < 0) {
 			if (errno == EAGAIN) {
-				bfd->when |= OSMO_FD_WRITE;
+				osmo_fd_write_enable(bfd);
 				break;
 			}
 			goto close;