ixgbe: add space between operands to &

This patch cleans up a checkpatch.pl style warning in the ixgbe code.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c

@@ -1586,7 +1586,7 @@ static int ixgbe_intr_test(struct ixgbe_adapter *adapter, u64 *data)
 		IXGBE_WRITE_FLUSH(&adapter->hw);
 		usleep_range(10000, 20000);
 
-		if (!(adapter->test_icr &mask)) {
+		if (!(adapter->test_icr & mask)) {
 			*data = 4;
 			break;
 		}