The branch stable/13 has been updated by dchagin:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=b4dc951c417ec3afbc7064c1c7c4d2ce9fe03ad9

commit b4dc951c417ec3afbc7064c1c7c4d2ce9fe03ad9
Author:     Dmitry Chagin <[email protected]>
AuthorDate: 2021-03-24 07:51:25 +0000
Commit:     Dmitry Chagin <[email protected]>
CommitDate: 2021-04-01 07:55:03 +0000

    Fix warning about signed comparison and drop WARNS for ktrdump(8).
    
    Reviewed By:            jhb, imp
    Differential Revision:  https://reviews.freebsd.org/D29381
    
    (cherry picked from commit 9e5aeba51b431256adfd18b087ee61b09bfd6a79)
---
 usr.bin/ktrdump/Makefile  |  2 --
 usr.bin/ktrdump/ktrdump.c | 14 +++++++-------
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/usr.bin/ktrdump/Makefile b/usr.bin/ktrdump/Makefile
index 63cd2cf2cea9..796569977f0f 100644
--- a/usr.bin/ktrdump/Makefile
+++ b/usr.bin/ktrdump/Makefile
@@ -4,6 +4,4 @@ PROG=   ktrdump
 LIBADD=        kvm
 MAN=   ktrdump.8
 
-WARNS?=        2
-
 .include <bsd.prog.mk>
diff --git a/usr.bin/ktrdump/ktrdump.c b/usr.bin/ktrdump/ktrdump.c
index 750f138f5485..bbe8fb19aae9 100644
--- a/usr.bin/ktrdump/ktrdump.c
+++ b/usr.bin/ktrdump/ktrdump.c
@@ -56,11 +56,11 @@ __FBSDID("$FreeBSD$");
 static void usage(void);
 
 static struct nlist nl[] = {
-       { "_ktr_version" },
-       { "_ktr_entries" },
-       { "_ktr_idx" },
-       { "_ktr_buf" },
-       { NULL }
+       { .n_name = "_ktr_version" },
+       { .n_name = "_ktr_entries" },
+       { .n_name = "_ktr_idx" },
+       { .n_name = "_ktr_buf" },
+       { .n_name = NULL }
 };
 
 static int cflag;
@@ -262,7 +262,7 @@ main(int ac, char **av)
                fprintf(out, "\n");
        }
 
-       tlast = -1;
+       tlast = UINTPTR_MAX;
        /*
         * Now tear through the trace buffer.
         *
@@ -327,7 +327,7 @@ next:                       if ((c = *p++) == '\0')
                if (tflag) {
                        tnow = (uintmax_t)buf[i].ktr_timestamp;
                        if (rflag) {
-                               if (tlast == -1)
+                               if (tlast == UINTPTR_MAX)
                                        tlast = tnow;
                                fprintf(out, "%16ju ", !iflag ? tlast - tnow :
                                    tnow - tlast);
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