eth: linkdata: sxevf: Fix wrong logic in 'sxevf_mailbox_lock'

SXE_VFMAILBOX_VFU is just a bitmask. We need to perform a bitwise
AND operation between this bitmask and the returned register value
to determine if the specific flags are set successfully.

Fix follow error with clang-19:

drivers/net/ethernet/linkdata/sxevf/sxevf/sxevf_msg.c:107:30: error: use of logical '&&' with constant operand [-Werror,-Wconstant-logical-operand]
  107 |                 if (sxevf_mbx_reg_read(hw) && SXE_VFMAILBOX_VFU) {
      |                                            ^  ~~~~~~~~~~~~~~~~~
drivers/net/ethernet/linkdata/sxevf/sxevf/sxevf_msg.c:107:30: note: use '&' for a bitwise operation
  107 |                 if (sxevf_mbx_reg_read(hw) && SXE_VFMAILBOX_VFU) {
      |                                            ^~
      |                                            &
drivers/net/ethernet/linkdata/sxevf/sxevf/sxevf_msg.c:107:30: note: remove constant to silence this warning
  107 |                 if (sxevf_mbx_reg_read(hw) && SXE_VFMAILBOX_VFU) {
      |                                            ^~~~~~~~~~~~~~~~~~~~
1 error generated.

Signed-off-by: WangYuli <[email protected]>

drivers/net/ethernet/linkdata/sxevf/sxevf/sxevf_msg.c

@@ -104,7 +104,7 @@ STATIC s32 sxevf_mailbox_lock(struct sxevf_hw *hw)
 		mailbox |= SXE_VFMAILBOX_VFU;
 		hw->mbx.ops->mailbox_write(hw, mailbox);
 
-		if (sxevf_mbx_reg_read(hw) && SXE_VFMAILBOX_VFU) {
+		if (sxevf_mbx_reg_read(hw) & SXE_VFMAILBOX_VFU) {
 			ret = 0;
 			break;
 		}