e1000/e1000: fix compile warning

e1000/e1000e compile report a possible unused variable, fix
that for now.  Shortly after this a small refactor and bug
fix will follow in the same code.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/e1000/e1000_main.c

@@ -3834,7 +3834,7 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
 	struct e1000_buffer *buffer_info;
 	unsigned int i, eop;
 	unsigned int count = 0;
-	bool cleaned;
+	bool cleaned = false;
 	unsigned int total_tx_bytes=0, total_tx_packets=0;
 
 	i = tx_ring->next_to_clean;

drivers/net/e1000e/netdev.c

@@ -621,7 +621,7 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter)
 	struct e1000_buffer *buffer_info;
 	unsigned int i, eop;
 	unsigned int count = 0;
-	bool cleaned;
+	bool cleaned = false;
 	unsigned int total_tx_bytes = 0, total_tx_packets = 0;
 
 	i = tx_ring->next_to_clean;