all repos — slstatus @ 914440b4fc3c5ecb7d9eedf4da6f2a1c7ec2e7a9

my build of slstatus (tools.suckless.org/slstatus/)

kernel_release.c

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#include <sys/utsname.h>
#include <stdio.h>

#include "util.h"

const char *
kernel_release(void)
{
	struct utsname udata;

	if (uname(&udata) < 0) {
		return NULL;
	}

	return bprintf("%s", udata.release);
}