e1000e: remove redundant might_sleep()

Now that mutex_lock() calls might_sleep() the driver doesn't have to here.
Signed-off-by: NBruce Allan <bruce.w.allan@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/e1000e/ich8lan.c

@@ -630,8 +630,6 @@ static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
 	u32 extcnf_ctrl, timeout = PHY_CFG_TIMEOUT;
 	s32 ret_val = 0;
 
-	might_sleep();
-
 	mutex_lock(&swflag_mutex);
 
 	while (timeout) {