e1000e: make a function static

This patch makes the needlessly global reg_pattern_test_array() static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/e1000e/ethtool.c

@@ -690,7 +690,7 @@ err_setup:
 	return err;
 }
 
-bool reg_pattern_test_array(struct e1000_adapter *adapter, u64 *data,
+static bool reg_pattern_test_array(struct e1000_adapter *adapter, u64 *data,
 				   int reg, int offset, u32 mask, u32 write)
 {
 	int i;