ixgbe: reduce checker warnings

Fix the sparse warnings in the ixgbe crypto offload code. These
changes were made in the most conservative way (force cast)
in order to hopefully not break the code. I suspect that the
code might still be broken on big-endian architectures, but
no one is complaining, so I'm just leaving it functionally
the same.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Cc: Shannon Nelson <snelson@pensando.io>
Tested-by: Dave Switzer <david.switzer@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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

@@ -511,14 +511,14 @@ static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
 					continue;
 
 				reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
-				if (reg == xs->id.daddr.a4)
+				if (reg == (__force u32)xs->id.daddr.a4)
 					return 1;
 			}
 		}
 
 		if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
 			reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
-			if (reg == xs->id.daddr.a4)
+			if (reg == (__force u32)xs->id.daddr.a4)
 				return 1;
 		}
 
@@ -533,7 +533,7 @@ static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
 
 			for (j = 0; j < 4; j++) {
 				reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
-				if (reg != xs->id.daddr.a6[j])
+				if (reg != (__force u32)xs->id.daddr.a6[j])
 					break;
 			}
 			if (j == 4)   /* did we match all 4 words? */
@@ -543,7 +543,7 @@ static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
 		if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
 			for (j = 0; j < 4; j++) {
 				reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
-				if (reg != xs->id.daddr.a6[j])
+				if (reg != (__force u32)xs->id.daddr.a6[j])
 					break;
 			}
 			if (j == 4)   /* did we match all 4 words? */