[PATCH] iwlwifi: avoid build warning in iwl-core.

[Rami Rosen <ramirose@gmail.com>]

When building when CONFIG_IWLWIFI_DEBUG is not set is not set, we get
the following
warning:
/work/src/w/drivers/net/wireless/iwlwifi/iwl-core.c: In function ‘iwl_isr’:
/work/src/w/drivers/net/wireless/iwlwifi/iwl-core.c:1707: warning:
unused variable ‘inta_fh’

This patch avoids this warning by adding #ifdef CONFIG_IWLWIFI_DEBUG
before the declaration of inta_fh in iwl_isr() in
drivers/net/wireless/iwlwifi/iwl-core.c

Signed-off-by: Rami Rosen <ramirose@gmail.com>

---
(wireless-testing).

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c
b/drivers/net/wireless/iwlwifi/iwl-core.c
index e93ddb7..811a525 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1704,8 +1704,9 @@ static irqreturn_t iwl_isr(int irq, void *data)
 {
 	struct iwl_priv *priv = data;
 	u32 inta, inta_mask;
+#ifdef CONFIG_IWLWIFI_DEBUG
 	u32 inta_fh;
-
+#endif
 	if (!priv)
 		return IRQ_NONE;