From a2ad92b2d7a475e91c6fb907bd734b962dc0ff31 Mon Sep 17 00:00:00 2001
From: David Sidrane <david_s5@nscdg.com>
Date: Fri, 21 Oct 2016 15:40:00 -1000
Subject: [PATCH] Bugfix: Hard Fault  hmc5883 with not params

Fault results from if (!strcmp(verb, "start")) {``` with null verb
---
 src/drivers/hmc5883/hmc5883.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/drivers/hmc5883/hmc5883.cpp b/src/drivers/hmc5883/hmc5883.cpp
index 165f1c26eb..18f8d76571 100644
--- a/src/drivers/hmc5883/hmc5883.cpp
+++ b/src/drivers/hmc5883/hmc5883.cpp
@@ -1779,6 +1779,11 @@ hmc5883_main(int argc, char *argv[])
 	bool calibrate = false;
 	bool temp_compensation = false;
 
+	if (argc < 2) {
+		hmc5883::usage();
+		exit(0);
+	}
+
 	while ((ch = getopt(argc, argv, "XISR:CT")) != EOF) {
 		switch (ch) {
 		case 'R':