makeinfo erases the file with -E and no texi file

[Dumas Patrice]

Hi,

When there is an error with makeinfo -E like:

$makeinfo -E ~/tmp/truc.texi
makeinfo: missing file argument.
Try `makeinfo --help' for more information.

The file ~/tmp/truc.texi is erased. Maybe it would be
better if the test of the file argument was achieved
before the file is opened ?

$makeinfo -o ~/tmp/machin.texi
don't erase the file.

Pat