Removing extra space in "sysctl: top level name in . is invalid"

[Neel Chauhan]

Hi,

I have noticed a bug. When running "sysctl ." or "sysctl kern." without 
my other patch, I get an extra space between "name" and "in":

sysctl: top level name  in . is invalid

It should be:

sysctl: top level name in . is invalid

I also have a patch.

What this patch does is if the top level name is a blank string "", we 
do not output anything. Otherwise, we output a space.

The patch is very minor, and may not get accepted (which I understand if 
it doesn't).

-Neel

Patch:

Index: sbin/sysctl/sysctl.c
===================================================================
RCS file: /cvs/src/sbin/sysctl/sysctl.c,v
retrieving revision 1.259
diff -u -p -u -r1.259 sysctl.c
--- sbin/sysctl/sysctl.c        17 May 2023 22:12:51 -0000      1.259
+++ sbin/sysctl/sysctl.c        29 Aug 2023 21:45:56 -0000
@@ -2957,7 +2957,9 @@ findname(char *string, char *level, char
                    strcmp(name, namelist->list[i].ctl_name) == 0)
                        break;
        if (i == namelist->size) {
-               warnx("%s level name %s in %s is invalid", level, name, string);
+               char sep = strcmp(name, "") == 0 ? '\0' : ' ';
+               warnx("%s level name %s%cin %s is invalid",
+                   level, name, sep, string);
                return (-1);
        }
        return (i);