net: phy: adin1100: Simplify register value passing

The additional use case for that variable is gone,
the expression is simple enough to pass it inline now.

Signed-off-by: Alexander Dahl <[e-mail]>
Reviewed-by: Russell King (Oracle) <[e-mail]>
Acked-by: Nuno Sá <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/adin1100.c

···
 static int adin_set_powerdown_mode(struct phy_device *phydev, bool en)
 {
 	int ret;
-	int val;
 
-	val = en ? ADIN_CRSM_SFT_PD_CNTRL_EN : 0;
 	ret = phy_write_mmd(phydev, MDIO_MMD_VEND1,
-			    ADIN_CRSM_SFT_PD_CNTRL, val);
+			    ADIN_CRSM_SFT_PD_CNTRL,
+			    en ? ADIN_CRSM_SFT_PD_CNTRL_EN : 0);
 	if (ret < 0)
 		return ret;