wifi: lib80211: Constify struct lib80211_crypto_ops

Now that functions in lib80211 handle "const struct lib80211_crypto_ops",
some structure can be constified as well.

Constifying these structures moves some data to a read-only section, so
increase overall security.

Before:
text data bss dec hex filename
7273 604 16 7893 1ed5 net/wireless/lib80211.o

After:
text data bss dec hex filename
7429 444 16 7889 1ed1 net/wireless/lib80211.o

Signed-off-by: Christophe JAILLET <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Link: https://patch.msgid.link/0cc3741c15[e-mail]
Signed-off-by: Johannes Berg <[e-mail]>

net/wireless/lib80211.c

···
 {
 }
 
-static struct lib80211_crypto_ops lib80211_crypt_null = {
+static const struct lib80211_crypto_ops lib80211_crypt_null = {
 	.name = "NULL",
 	.init = lib80211_crypt_null_init,
 	.deinit = lib80211_crypt_null_deinit,

net/wireless/lib80211_crypt_ccmp.c

···
 		   ccmp->dot11RSNAStatsCCMPDecryptErrors);
 }
 
-static struct lib80211_crypto_ops lib80211_crypt_ccmp = {
+static const struct lib80211_crypto_ops lib80211_crypt_ccmp = {
 	.name = "CCMP",
 	.init = lib80211_ccmp_init,
 	.deinit = lib80211_ccmp_deinit,

net/wireless/lib80211_crypt_tkip.c

···
 		   tkip->dot11RSNAStatsTKIPLocalMICFailures);
 }
 
-static struct lib80211_crypto_ops lib80211_crypt_tkip = {
+static const struct lib80211_crypto_ops lib80211_crypt_tkip = {
 	.name = "TKIP",
 	.init = lib80211_tkip_init,
 	.deinit = lib80211_tkip_deinit,

net/wireless/lib80211_crypt_wep.c

···
 	seq_printf(m, "key[%d] alg=WEP len=%d\n", wep->key_idx, wep->key_len);
 }
 
-static struct lib80211_crypto_ops lib80211_crypt_wep = {
+static const struct lib80211_crypto_ops lib80211_crypt_wep = {
 	.name = "WEP",
 	.init = lib80211_wep_init,
 	.deinit = lib80211_wep_deinit,