[Bug 242350] Vmstat does not have space between "fre" and "flt" field in text format.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242350

            Bug ID: 242350
           Summary: Vmstat does not have space between "fre" and "flt"
                    field in text format.
           Product: Base System
           Version: 11.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: fbsd-bugzilla at aj.admwt.jp

In my FreeBSD server, vmstat reports the follows.
====================================
procs     memory        page                    disks     faults         cpu
r b w     avm     fre  flt  re  pi  po    fr   sr ad0 md99   in    sy    cs us
sy id
1 0 0  402856  138956    0   0   0   0     0   47   1   0   43   169   126  1 
0 99
1 0 0  402856  138940   91   0   0   0    86   47   9   0  128   683   340  2 
0 98
1 0 0  553772   88508 3354   0   0   0   576   50  24   0  380  2487   878 16 
1 83
55 0 0 1403424   2014827881   4   2   0 25098 18597  26   1  541 14644  1111 78
12  9
45 0 5 1544552    6396 7979 412   8 301  6708 301295 874 298 1381  4570  4770
29  9 62
15 0 4 1548180   66284 5619 175  50 1099 11022 22044 1013 367 4636  6704 16617
13  4 83
7 0 28 1659472   1602811158 430  42 363 10102 6736 896 311 1740  7383  6149 29 
8 63
0 0 39 1654176   18220 8308 878  34 267  8280 7793 891 287 1167  3218  4333 18 
6 76
0 0 33 1553232   68684 2556 130  15  14  4045  623  80  25  184   905   619  4 
1 95
1 0 24 1453984  117764 2566   0   2   0  3584  217   7   2   75   718   225  4 
0 96
1 0 12 1338444  165204 1975   0  14   0  2981  200  13  14   85   397   287  2 
0 98
0 0 3 1222904  212396 3691   0  15   0  2919  185  31  15  220  1080   647  6 
2 92
0 0 3 1130472  261972  238   0   4   0  2645  169   3   4   39   225   137  0 
0 100
====================================

It is difficult to separate value of "fre" and "flt" from above example.
I made quick patch to solve this problem. Here it patch. And, It works fine for
me.

Thanks in advance.

--- src/usr.bin/vmstat/vmstat.c-   2019-07-25 11:53:04.499680000 +0900
+++ src/usr.bin/vmstat/vmstat.c    2019-11-28 15:49:54.655633000 +0900
@@ -794,7 +794,8 @@
                        xo_emit("{:free-memory/%7d}",
                            vmstat_pgtok(total.t_free));
                }
-               xo_emit("{:total-page-faults/%5lu} ",
+               xo_emit(" ");
+               xo_emit("{:total-page-faults/%4lu} ",
                    (unsigned long)rate(sum.v_vm_faults -
                    osum.v_vm_faults));
                xo_close_container("memory");

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