atl1[ce]: fix sparse warnings

The dmaw_block is an enum and max_pay_load is u32. Therefore
sparse gives warning about comparison of unsigned and signed value.
Resolve by using min_t to force cast.
Signed-off-by: NStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/atl1c/atl1c_main.c

@@ -1102,10 +1102,10 @@ static void atl1c_configure_tx(struct atl1c_adapter *adapter)
 	AT_READ_REG(hw, REG_DEVICE_CTRL, &dev_ctrl_data);
 	max_pay_load  = (dev_ctrl_data >> DEVICE_CTRL_MAX_PAYLOAD_SHIFT) &
 			DEVICE_CTRL_MAX_PAYLOAD_MASK;
-	hw->dmaw_block = min(max_pay_load, hw->dmaw_block);
+	hw->dmaw_block = min_t(u32, max_pay_load, hw->dmaw_block);
 	max_pay_load  = (dev_ctrl_data >> DEVICE_CTRL_MAX_RREQ_SZ_SHIFT) &
 			DEVICE_CTRL_MAX_RREQ_SZ_MASK;
-	hw->dmar_block = min(max_pay_load, hw->dmar_block);
+	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
 
 	txq_ctrl_data = (hw->tpd_burst & TXQ_NUM_TPD_BURST_MASK) <<
 			TXQ_NUM_TPD_BURST_SHIFT;

drivers/net/atl1e/atl1e_main.c

@@ -932,11 +932,11 @@ static inline void atl1e_configure_tx(struct atl1e_adapter *adapter)
 	max_pay_load  = ((dev_ctrl_data >> DEVICE_CTRL_MAX_PAYLOAD_SHIFT)) &
 			DEVICE_CTRL_MAX_PAYLOAD_MASK;
 
-	hw->dmaw_block = min(max_pay_load, hw->dmaw_block);
+	hw->dmaw_block = min_t(u32, max_pay_load, hw->dmaw_block);
 
 	max_pay_load  = ((dev_ctrl_data >> DEVICE_CTRL_MAX_RREQ_SZ_SHIFT)) &
 			DEVICE_CTRL_MAX_RREQ_SZ_MASK;
-	hw->dmar_block = min(max_pay_load, hw->dmar_block);
+	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
 
 	if (hw->nic_type != athr_l2e_revB)
 		AT_WRITE_REGW(hw, REG_TXQ_CTRL + 2,