Without the patch, the following gcc-12 compiler warnings are emitted
for lkcd_*.c:

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];
        |                              ^~~~~~~~~~~~~~~
...

Reported-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
---
v2
- fixed typo

   lkcd_v1.c    | 3 +--
   lkcd_v2_v3.c | 3 +--
   lkcd_v5.c    | 3 +--
   lkcd_v7.c    | 3 +--
   lkcd_v8.c    | 3 +--
   5 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/lkcd_v1.c b/lkcd_v1.c
index 5f891ae..31bdc04 100644
--- a/lkcd_v1.c
+++ b/lkcd_v1.c
@@ -249,8 +249,7 @@ dump_header_only:
           lkcd_print("          dh_eip: %lx\n", dh->dh_eip);
        lkcd_print("    dh_num_pages: %d\n", dh->dh_num_pages);
           lkcd_print(" dh_panic_string: %s%s", dh->dh_panic_string,
-               dh && dh->dh_panic_string &&
-               strstr(dh->dh_panic_string, "\n") ? "" : "\n");
+               dh && strstr(dh->dh_panic_string, "\n") ? "" : "\n");
           lkcd_print("         dh_time: %s\n",
                           strip_linefeeds(ctime(&(dh->dh_time.tv_sec))));

diff --git a/lkcd_v2_v3.c b/lkcd_v2_v3.c
index 8635a7b..edcb663 100644
--- a/lkcd_v2_v3.c
+++ b/lkcd_v2_v3.c
@@ -307,8 +307,7 @@ dump_header_only:
        lkcd_print("    dh_num_pages: ");
        lkcd_print(BITS32() ? "%ld\n" : "%d\n", dh->dh_num_pages);
           lkcd_print(" dh_panic_string: %s%s", dh->dh_panic_string,
-               dh && dh->dh_panic_string &&
-               strstr(dh->dh_panic_string, "\n") ? "" : "\n");
+               dh && strstr(dh->dh_panic_string, "\n") ? "" : "\n");
           lkcd_print("         dh_time: %s\n",
                           strip_linefeeds(ctime(&(dh->dh_time.tv_sec))));

diff --git a/lkcd_v5.c b/lkcd_v5.c
index cb7634d..e3bfa6f 100644
--- a/lkcd_v5.c
+++ b/lkcd_v5.c
@@ -270,8 +270,7 @@ dump_header_only:
        lkcd_print("    dh_num_pages: ");
        lkcd_print(BITS32() ? "%ld\n" : "%d\n", dh->dh_num_pages);
           lkcd_print(" dh_panic_string: %s%s", dh->dh_panic_string,
-               dh && dh->dh_panic_string &&
-               strstr(dh->dh_panic_string, "\n") ? "" : "\n");
+               dh && strstr(dh->dh_panic_string, "\n") ? "" : "\n");
           lkcd_print("         dh_time: %s\n",
                           strip_linefeeds(ctime(&(dh->dh_time.tv_sec))));

diff --git a/lkcd_v7.c b/lkcd_v7.c
index 608e148..97d9900 100644
--- a/lkcd_v7.c
+++ b/lkcd_v7.c
@@ -347,8 +347,7 @@ dump_header_only:
        lkcd_print("    dh_num_pages: ");
        lkcd_print(BITS32() ? "%ld\n" : "%d\n", dh->dh_num_pages);
           lkcd_print(" dh_panic_string: %s%s", dh->dh_panic_string,
-               dh && dh->dh_panic_string &&
-               strstr(dh->dh_panic_string, "\n") ? "" : "\n");
+               dh && strstr(dh->dh_panic_string, "\n") ? "" : "\n");
           lkcd_print("         dh_time: %s\n",
                           strip_linefeeds(ctime(&(dh->dh_time.tv_sec))));

diff --git a/lkcd_v8.c b/lkcd_v8.c
index 3b355e0..4167fa5 100644
--- a/lkcd_v8.c
+++ b/lkcd_v8.c
@@ -543,8 +543,7 @@ dump_header_only:
        lkcd_print("    dh_num_pages: ");
        lkcd_print(BITS32() ? "%ld\n" : "%d\n", dh->dh_num_pages);
           lkcd_print(" dh_panic_string: %s%s", dh->dh_panic_string,
-               dh && dh->dh_panic_string &&
-               strstr(dh->dh_panic_string, "\n") ? "" : "\n");
+               dh && strstr(dh->dh_panic_string, "\n") ? "" : "\n");
        tv.tv_sec = dh->dh_time.tv_sec;
           lkcd_print("         dh_time: %s\n",
                           strip_linefeeds(ctime(&(tv.tv_sec))));
--
2.37.1