groff -Tdvi prints a cryptic error message

[Sam Steingold]

<https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=89210>

groff -Tdvi prints 2 error messages,
then proceeds to produce the apparently correct output.

Version-Release number of selected component (if applicable):
groff-1.18.1-20

Steps to Reproduce:
$ touch zz.1
$ groff -Tdvi -mandoc zz.1 > /dev/null
/usr/share/groff/1.18.1/font/devdvi/M:6: error: bad width for `\x{FFFD}\x{FFFD}'
troff: warning: can't find font `M'
/usr/share/groff/1.18.1/font/devdvi/G:6: error: bad width for `\x{FFFD}\x{FFFD}'
troff: warning: can't find font `G'

Actual Results:  two errors and two warnings are printed for any input.
Expected Results:  no errors or warnings should be produced.

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Sam Steingold (http://www.podval.org/~sds) running RedHat9 GNU/Linux
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