iwlwifi: fix sparse warning

sparse correctly warns about symbol not
being static, make static to shut it up.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -705,7 +705,7 @@ static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base,
 	spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 }
 
-void iwl_continuous_event_trace(struct iwl_priv *priv)
+static void iwl_continuous_event_trace(struct iwl_priv *priv)
 {
 	u32 capacity;   /* event log capacity in # entries */
 	u32 base;       /* SRAM byte address of event log header */