[PATCH v2 2/2] iw: fix ftm_request missing arguments segfault

[Benjamin Aschenbrenner <benjamin.aschenbrenner@xxxxxxxxx>]

When expected argument <config-file> is not passed to arguemts iw
segfaults.

Example: iw wlp2s0 measurement ftm_request

This fixes it.

Signed-off-by: Benjamin Aschenbrenner <benjamin.aschenbrenner@xxxxxxxxx>
---
 measurements.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/measurements.c b/measurements.c
index 635d942..80fe785 100644
--- a/measurements.c
+++ b/measurements.c
@@ -282,6 +282,9 @@ static int handle_ftm_req_send(struct nl80211_state *state, struct nl_msg *msg,
 	const char *file;
 	int err;
 
+	if (argc < 1)
+		return HANDLER_RET_USAGE;
+
 	file = argv[0];
 	argc--;
 	argv++;
-- 
2.30.2