Fixes following warning during the boot:

 WARNING: Variable 'led' does not exist or is not an array/object

Signed-off-by: Petr Štetiar <[email protected]>
---
 target/linux/x86/base-files/etc/diag.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/linux/x86/base-files/etc/diag.sh 
b/target/linux/x86/base-files/etc/diag.sh
index 3af4b235837b..d043e4f03535 100644
--- a/target/linux/x86/base-files/etc/diag.sh
+++ b/target/linux/x86/base-files/etc/diag.sh
@@ -20,6 +20,8 @@ preinit_match_diag_led() {
        json_init
        json_load "$(cat $CFG)"
        json_get_keys keys led
+       json_is_a led object || return
+
        json_select led
        for key in $keys; do
                json_select "$key"
-- 
1.9.1


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