[patch 3/3] d80211: silence sparse warning: bad constant expression

[David Kimdon <david.kimdon@devicescape.com>]

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Sparse does not figure out that algs[] isn't really a variable length array.
The message is:

net/d80211/ieee80211_sta.c:934:12: error: bad constant expression

This switches algs[] to be obviously a constant array, and derives the value of
num_algs algs[].  The code is correct and equivalent with or without this
change.

Signed-off-by: David Kimdon <david.kimdon@devicescape.com>

Index: wireless-dev/net/d80211/ieee80211_sta.c
===================================================================
--- wireless-dev.orig/net/d80211/ieee80211_sta.c
+++ wireless-dev/net/d80211/ieee80211_sta.c
@@ -930,8 +930,8 @@ static void ieee80211_rx_mgmt_auth(struc
 		printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
 		       "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
 		if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
-			const int num_algs = 3;
-			u8 algs[num_algs];
+			u8 algs[3];
+			const int num_algs = sizeof(algs) / sizeof(algs[0]);
 			int i, pos;
 			algs[0] = algs[1] = algs[2] = 0xff;
 			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)

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