config: Add NUL terminator check in config_get_entry header line scan

common/lib/config.c

@@ -642,7 +642,7 @@ static char *config_get_entry(size_t *size, size_t index) {
 
     do {
         p++;
-    } while (*p != '\n');
+    } while (*p != '\n' && *p != '\0');
 
     ret = p;