[PATCH] plug memory leak in diff.c::diff_free_filepair()

When I run git-diff-tree on big change, it seems the command eats so
much memory.  so I just put git under valgrind to see what's going on.
diff_free_filespec_data() doesn't free diff_filespec itself.

[jc: I ended up doing things slightly differently from Yasushi's
patch.  The original idea was to use free_filespec_data() only to
free the data portion and keep useing the filespec itself, but
no existing code seems to do things that way, so I just yanked
that part out.]

Signed-off-by: Yasushi SHOJI <yashi@atmark-techno.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diffcore-break.c

@@ -231,8 +231,8 @@ static void merge_broken(struct diff_filepair *p,
 
 	dp = diff_queue(outq, d->one, c->two);
 	dp->score = p->score;
-	diff_free_filespec_data(d->two);
-	diff_free_filespec_data(c->one);
+	diff_free_filespec(d->two);
+	diff_free_filespec(c->one);
 	free(d);
 	free(c);
 }