ixgbe: remove redundant initialization of 'pool'

Variable pool is being assigned zero and then in the following for-loop
is it being set to zero again. Remove the redundant first assignment.

Cleans up clang warning:
drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c:61:2: warning: Value stored
to 'pool' is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

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

@@ -58,7 +58,6 @@ static bool ixgbe_cache_ring_dcb_sriov(struct ixgbe_adapter *adapter)
 		return false;
 
 	/* start at VMDq register offset for SR-IOV enabled setups */
-	pool = 0;
 	reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask);
 	for (i = 0, pool = 0; i < adapter->num_rx_queues; i++, reg_idx++) {
 		/* If we are greater than indices move to next pool */