Re: [PATCH] git-mv: Fix error with multiple sources.

"David Rydh" [off-list ref] writes:

This commit also fixed two potentially dangerous uses of
prefix_filename() -- which returns static storage space -- in
builtin-config.c and hash-object.c.

This should probably be a separate patch.  builtin-hash-object.c also uses
prefix_filename() first to obtain vpath without strdup() and then uses the
function to create arg, which seems to be unsafe to me.  I've looked at
all the hits from 

    $ git grep -n -e prefix_filename\( -- '*.c'

and other places seem to be Ok.