[Bug 240571] m4 divert( X-with-spaces ) -> argument is invalid

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240571

            Bug ID: 240571
           Summary: m4 divert( X-with-spaces ) -> argument is invalid
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: warlock at phouka.net

For 12/stable (now 12.1-PRERELEASE) between r352217 and r352298 (and I presume
the MFC of r352065-r352070 in r352277), m4 lost it's ability to divert( -1 ) to
ignore an input stream.  Note the spaces around the number.

# grep '^FreeBSD 12' /.zfs/snapshot/2019-09-13-10:54:12/etc/motd /etc/motd
/.zfs/snapshot/2019-09-13-10:54:12/etc/motd:FreeBSD 12.1-PRERELEASE (GENERIC)
#106 r352217+0e6a9a9426c7(stable/12): Wed Sep 11 10:30:02 PDT 2019
/etc/motd:FreeBSD 12.1-PRERELEASE (GENERIC) #108
r352298+2356cf5555c7(stable/12): Fri Sep 13 10:49:27 PDT 2019

# cat /tmp/m4.txt 
begin
divert(-1)dnl
middle
divert( -1 )dnl
foo
divert(0)dnl
end

# m4 < /tmp/m4.txt 
begin
m4: stdin at line 4: divert: argument is invalid: -1 .

# /.zfs/snapshot/2019-09-13-10:54:12/usr/bin/m4 < /tmp/m4.txt 
begin
end

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