iwlwifi: remove per-device debug level

There's no need for the per-device debug
level that we expose in debugfs since the
module parameter is writable in sysfs.

At the same time, simplify code by changing
    iwl_get_debug_level(shrd) & IWL_DL_ISR)
to
    iwl_have_debug_level(IWL_DL_ISR)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-debug.c b/drivers/net/wireless/iwlwifi/iwl-debug.c
index 4bc2e70..059efab 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debug.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debug.c
@@ -104,7 +104,7 @@
 }
 
 #if defined(CONFIG_IWLWIFI_DEBUG) || defined(CONFIG_IWLWIFI_DEVICE_TRACING)
-void __iwl_dbg(struct iwl_shared *shared, struct device *dev,
+void __iwl_dbg(struct device *dev,
 	       u32 level, bool limit, const char *function,
 	       const char *fmt, ...)
 {
@@ -116,7 +116,7 @@
 	va_start(args, fmt);
 	vaf.va = &args;
 #ifdef CONFIG_IWLWIFI_DEBUG
-	if (iwl_get_debug_level(shared) & level &&
+	if (iwl_have_debug_level(level) &&
 	    (!limit || net_ratelimit()))
 		dev_err(dev, "%c %s %pV", in_interrupt() ? 'I' : 'U',
 			function, &vaf);