Crash on file names containing invalid UTF-8 sequence

When there's an unversioned file whose name contains an invalid UTF-8
sequence, Subversion crashes:

$ echo $LC_ALL
en_US.utf8
$ svn st -q
$ touch `echo subversion.äöü | recode utf8..latin1`
$ svn st -q
svn: Valid UTF-8 data
(hex: 73 75 62 76 65 72 73 69 6f 6e 2e)
followed by invalid UTF-8 sequence
(hex: e4 f6 fc)

This is unnecessary because the file is unversioned anyway.
Furthermore, the error message is not particularly helpful.

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