Make sure config list is not empty before trying to access it

xtldr2/config.c

@@ -30,6 +30,9 @@ BlGetConfigValue(IN CONST PWCHAR ConfigName)
     /* Get config entry name length */
     Length = RtlWideStringLength(ConfigName, 0);
 
+    /* Make sure config list is not empty */
+    if(BlpConfig != NULL)
+    {
         /* Iterate through config entries */
         ConfigListEntry = BlpConfig->Flink;
         while(ConfigListEntry != BlpConfig)
@@ -47,6 +50,7 @@ BlGetConfigValue(IN CONST PWCHAR ConfigName)
             /* Move to the next config entry */
             ConfigListEntry = ConfigListEntry->Flink;
         }
+    }
 
     /* Config entry not found, return NULL */
     return NULL;