ayufan: dev.mk: fix incompatibile board

Change-Id: I64b5b83cf975e534e55559cbb9bd99744697859b

Author: ayufan

dev-ayufan/root/usr/local/lib/u-boot-rockchip/loader-common

@@ -62,7 +62,7 @@ esac
 
 if ! grep -qi "$BOARD" /proc/device-tree/compatible; then
     echo "You are currently running on different board:"
-    cat /proc/device-tree/model || true
+    echo "$(cat /proc/device-tree/model || true)"
     echo "It may brick your device or the system unless"
     echo "you know what are you doing."
     echo ""