Cleanup: use constant

Signed-off-by: Niklaus Giger <niklaus.giger@netstal.com>
diff --git a/common/miiphyutil.c b/common/miiphyutil.c
index 66fd9ca..196ef4a 100644
--- a/common/miiphyutil.c
+++ b/common/miiphyutil.c
@@ -299,7 +299,7 @@
 		debug ("PHY status read failed\n");
 		return (-1);
 	}
-	if (miiphy_write (devname, addr, PHY_BMCR, reg | 0x8000) != 0) {
+	if (miiphy_write (devname, addr, PHY_BMCR, reg | PHY_BMCR_RESET) != 0) {
 		debug ("PHY reset failed\n");
 		return (-1);
 	}