msc_main: do not say 'osmo-nitb' in the usage

Change-Id: I2090097dc0d7e0251c116b95b802076df3419455
diff --git a/src/osmo-msc/msc_main.c b/src/osmo-msc/msc_main.c
index 00f132b..aba74b6 100644
--- a/src/osmo-msc/msc_main.c
+++ b/src/osmo-msc/msc_main.c
@@ -112,7 +112,7 @@
 
 static void print_usage()
 {
-	printf("Usage: osmo-nitb\n");
+	printf("Usage: osmo-msc\n");
 }
 
 static void print_help()