compilation failure with GCC 12

[tmonjalo]

GCC 12 emits this error:

wd.c: In function 'wd_is_isolate':
wd.c:193:21: error: the comparison will always evaluate as 'true' for the address of 'dev_root' will never be NULL [-Werror=address]
  193 |         if (!dev || !dev->dev_root)
      |                     ^
In file included from wd.c:21:
./include/wd.h:131:14: note: 'dev_root' declared here
  131 |         char dev_root[PATH_STR_SIZE];
      |              ^~~~~~~~

dev_root being an initialized array, it cannot be NULL.
It should be fixed with this patch:

--- a/wd.c
+++ b/wd.c
@@ -190,7 +190,7 @@ int wd_is_isolate(struct uacce_dev *dev)
        int value = 0;
        int ret;
 
-       if (!dev || !dev->dev_root)
+       if (!dev)
                return -WD_EINVAL;
 
        ret = access_attr(dev->dev_root, "isolate", F_OK);

[gaozhangfei]

Thanks, Thomas

#540