[PATCH iw 2/4] iw: link: mention the need for MAC addr arg in link get_sta cmd usage menu

The usage menu shown when running the hidden "link get_sta" command is not
mentioning the need for the MAC address argument. Without this, the cmd is
always failing with the output shown below.

 $ ./iw dev wlan0 link get_sta
 Usage:  ./iw [options] dev <devname> link get_sta
 ...

To avoid this, let the user know about the mandatory "MAC address" argument
like below.

 $ ./iw dev wlan0 link get_sta
 Usage:  ./iw [options] dev <devname> link get_sta <mac-addr>
 ...

Signed-off-by: Gokul Sivakumar <redacted>
---
 link.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/link.c b/link.c
index 1ed7f63..2074488 100644
--- a/link.c
+++ b/link.c

@@ -273,7 +273,7 @@ static int handle_link(struct nl80211_state *state,
 }
 TOPLEVEL(link, NULL, 0, 0, CIB_NETDEV, handle_link,
 	 "Print information about the current link, if any.");
-HIDDEN(link, get_sta, "", NL80211_CMD_GET_STATION, 0,
+HIDDEN(link, get_sta, "<mac-addr>", NL80211_CMD_GET_STATION, 0,
 	CIB_NETDEV, handle_link_sta);
 HIDDEN(link, get_bss, NULL, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
 	CIB_NETDEV, handle_scan_for_link);

-- 
2.25.1