[Patch] Fix error message in dmesg.c

[Xiao Nan]

Hi all,

I modify error message in dmesg.c. Patch is attached, apologize if I'm wrong.

Thanks!

Best Regards
Nan Xiao

Index: dmesg.c
===================================================================
RCS file: /cvs/src/sbin/dmesg/dmesg.c,v
retrieving revision 1.27
diff -u -p -r1.27 dmesg.c
--- dmesg.c9 Oct 2015 01:37:06 -00001.27
+++ dmesg.c26 Aug 2017 03:23:55 -0000
@@ -95,8 +95,12 @@ main(int argc, char *argv[])
 mib[0] = CTL_KERN;
 mib[1] = startupmsgs ? KERN_CONSBUFSIZE : KERN_MSGBUFSIZE;
 len = sizeof(msgbufsize);
-if (sysctl(mib, 2, &msgbufsize, &len, NULL, 0))
-err(1, "sysctl: KERN_MSGBUFSIZE");
+if (sysctl(mib, 2, &msgbufsize, &len, NULL, 0)) {
+if (startupmsgs)
+err(1, "sysctl: KERN_CONSBUFSIZE");
+else
+err(1, "sysctl: KERN_MSGBUFSIZE");
+}

 msgbufsize += sizeof(struct msgbuf) - 1;
 bufdata = calloc(1, msgbufsize);
@@ -105,8 +109,12 @@ main(int argc, char *argv[])

 mib[1] = startupmsgs ? KERN_CONSBUF : KERN_MSGBUF;
 len = msgbufsize;
-if (sysctl(mib, 2, bufdata, &len, NULL, 0))
-err(1, "sysctl: KERN_MSGBUF");
+if (sysctl(mib, 2, bufdata, &len, NULL, 0)) {
+if (startupmsgs)
+err(1, "sysctl: KERN_CONSBUF");
+else
+err(1, "sysctl: KERN_MSGBUF");
+}

 if (pledge("stdio", NULL) == -1)
 err(1, "pledge");
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