I have one question about it:

This issue only appears in gcc-11 and earlier, I tested it with gcc-12, but it disappeared. It's interesting.

In addition, a new warning was found(gcc-12), but it is not related to this patch.

...

gcc -c -g -DX86_64 -DLZO -DGDB_10_2 -g -O2 lkcd_v1.c -DMCLX -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector -Wformat-security
lkcd_v1.c: In function ‘dump_lkcd_environment_v1’:
lkcd_v1.c:252:20: warning: the comparison will always evaluate as ‘true’ for the address of ‘dh_panic_string’ will never be NULL [-Waddress]
  252 |                 dh && dh->dh_panic_string &&
      |                    ^~
In file included from lkcd_v1.c:21:
lkcd_vmdump_v1.h:108:30: note: ‘dh_panic_string’ declared here
  108 |         char                 dh_panic_string[DUMP_PANIC_LEN];
      |                              ^~~~~~~~~~~~~~~
gcc -c -g -DX86_64 -DLZO -DGDB_10_2 -g -O2 lkcd_v2_v3.c -DMCLX -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector -Wformat-security
lkcd_v2_v3.c: In function ‘dump_lkcd_environment_v2_v3’:
lkcd_v2_v3.c:310:20: warning: the comparison will always evaluate as ‘true’ for the address of ‘dh_panic_string’ will never be NULL [-Waddress]
  310 |                 dh && dh->dh_panic_string &&
      |                    ^~
In file included from lkcd_v2_v3.c:21:
lkcd_vmdump_v2_v3.h:205:30: note: ‘dh_panic_string’ declared here
  205 |         char                 dh_panic_string[DUMP_PANIC_LEN];
      |                              ^~~~~~~~~~~~~~~
gcc -c -g -DX86_64 -DLZO -DGDB_10_2 -g -O2 lkcd_v5.c -DMCLX -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector -Wformat-security
lkcd_v5.c: In function ‘dump_lkcd_environment_v5’:
lkcd_v5.c:273:20: warning: the comparison will always evaluate as ‘true’ for the address of ‘dh_panic_string’ will never be NULL [-Waddress]
  273 |                 dh && dh->dh_panic_string &&
      |                    ^~
In file included from lkcd_v5.c:20:
lkcd_dump_v5.h:163:30: note: ‘dh_panic_string’ declared here
  163 |         char                 dh_panic_string[DUMP_PANIC_LEN];
      |                              ^~~~~~~~~~~~~~~
gcc -c -g -DX86_64 -DLZO -DGDB_10_2 -g -O2 lkcd_v7.c -DMCLX -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector -Wformat-security
lkcd_v7.c: In function ‘dump_lkcd_environment_v7’:
lkcd_v7.c:350:20: warning: the comparison will always evaluate as ‘true’ for the address of ‘dh_panic_string’ will never be NULL [-Waddress]
  350 |                 dh && dh->dh_panic_string &&
      |                    ^~
In file included from lkcd_v7.c:21:
lkcd_dump_v5.h:163:30: note: ‘dh_panic_string’ declared here
  163 |         char                 dh_panic_string[DUMP_PANIC_LEN];
      |                              ^~~~~~~~~~~~~~~
gcc -c -g -DX86_64 -DLZO -DGDB_10_2 -g -O2 lkcd_v8.c -DMCLX -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector -Wformat-security
lkcd_v8.c: In function ‘dump_lkcd_environment_v8’:
lkcd_v8.c:546:20: warning: the comparison will always evaluate as ‘true’ for the address of ‘dh_panic_string’ will never be NULL [-Waddress]
  546 |                 dh && dh->dh_panic_string &&
      |                    ^~
In file included from lkcd_v8.c:23:
lkcd_dump_v8.h:165:30: note: ‘dh_panic_string’ declared here
  165 |         char                 dh_panic_string[DUMP_PANIC_LEN];

...

Thanks.

Lianbo