osmo-arfcn: Fix '-h' option

Change-Id: I13decca25dcdb75191c1e78058704ae8efa69b33
diff --git a/utils/osmo-arfcn.c b/utils/osmo-arfcn.c
index aee132c..5087842 100644
--- a/utils/osmo-arfcn.c
+++ b/utils/osmo-arfcn.c
@@ -100,7 +100,7 @@
 	char *param;
 	enum program_mode mode = MODE_NONE;
 
-	while ((opt = getopt(argc, argv, "pa:f:ud")) != -1) {
+	while ((opt = getopt(argc, argv, "pa:f:udh")) != -1) {
 		switch (opt) {
 		case 'p':
 			pcs = 1;