vcs-svn: reset first_commit_done in fast_export_init

first_commit_done has zero as a default value, but it
is not reset back to zero in fast_export_init.

Reset it back to zero so that each export will have
proper initial state.

Signed-off-by: Dmitry Ivankov <divanorama@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

vcs-svn/fast_export.c

@@ -31,6 +31,7 @@ static int init_postimage(void)
 
 void fast_export_init(int fd)
 {
+	first_commit_done = 0;
 	if (buffer_fdinit(&report_buffer, fd))
 		die_errno("cannot read from file descriptor %d", fd);
 }