user_shell: Fix unchecked return value of osmo_fd_register()

Fixes: CID#307519: Unchecked return value (CHECKED_RETURN)
Change-Id: I68ed44464573b9a6fecd07cf13fd2d6f4a1013bb
---
M src/client/user_shell.c
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/client/user_shell.c b/src/client/user_shell.c
index 5d37e97..f0dcd55 100644
--- a/src/client/user_shell.c
+++ b/src/client/user_shell.c
@@ -170,11 +170,15 @@
 int client_user_main(struct bankd_client *bc)
 {
 	struct stdin_state ss;
+	int rc;
 
 	/* register stdin file descriptor with osmocom select loop abstraction */
 	memset(&ss, 0, sizeof(ss));
 	osmo_fd_setup(&ss.ofd, fileno(stdin), OSMO_FD_READ, &stdin_fd_cb, &ss, 0);
-	osmo_fd_register(&ss.ofd);
+	rc = osmo_fd_register(&ss.ofd);
+	if (rc < 0)
+		return rc;
+
 	ss.bc = bc;
 
 	while (1) {

