crda: fix -pedantic gcc compilation

gcc likes to complain about this, fix that as we're
going to get a bit more anal with code here soon as
we're moving towards making a library out of reglib.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
diff --git a/crda.c b/crda.c
index 2a601eb..4751a39 100644
--- a/crda.c
+++ b/crda.c
@@ -141,13 +141,15 @@
 {
 	int fd = -1;
 	int i = 0, j, r;
-	char alpha2[3] = {}; /* NUL-terminate */
+	char alpha2[3];
 	char *env_country;
 	struct nl80211_state nlstate;
 	struct nl_cb *cb = NULL;
 	struct nl_msg *msg;
 	int finished = 0;
 
+	memset(alpha2, 0, 3);
+
 	struct nlattr *nl_reg_rules;
 	const struct ieee80211_regdomain *rd = NULL;