bsc_vty: Fix missing break statements in switch()

Change-Id: Ifd48e8d56c845603d320748144b4d7c3c24022a0
Fixes: Coverity CID 135188
Fixes: Coverity CID 135190
diff --git a/openbsc/src/libbsc/bsc_vty.c b/openbsc/src/libbsc/bsc_vty.c
index e3ec8d9..01ee4df 100644
--- a/openbsc/src/libbsc/bsc_vty.c
+++ b/openbsc/src/libbsc/bsc_vty.c
@@ -2799,9 +2799,11 @@
 	case -ENOMEM:
 		vty_out(vty, "Unable to add arfcn: max number of UARFCNs (%u) "
 			"reached%s", MAX_EARFCN_LIST, VTY_NEWLINE);
+		return CMD_WARNING;
 	case -ENOSPC:
 		vty_out(vty, "Warning: not enough space in si2quater for a "
 			"given arfcn%s", VTY_NEWLINE);
+		return CMD_WARNING;
 	case -EADDRINUSE:
 		vty_out(vty, "Unable to add arfcn: (%u, %u) is already added%s",
 			arfcn, scramble, VTY_NEWLINE);