Broken directory pathname pruning..

The directory-based pathname pruning doesn't work any more.

I used to just say

	git-whatchanged -v -p drivers/usb/

and I just noticed that it doesn't work any more.

It _does_ work if I leave the final '/' off the thing.

diff-tree itself does this right: that's shown by the fact that with the
slash in place, we still do get the right _changelog_ that is restricted
to drivers/usb changes, but the diffs themselves are missing.

So it seems to be purely "diffcore_pathspec()" that is broken.

Btw, I don't think we should call "diffcore_pathspec()" at all in
diff-tree, because diff-tree already handles "interesting" paths correctly
(and has to do so for performance reasons, since it's not acceptable to
expand all the trees and diff them).

So in the "git-whatchanged"  case the fix is as simple as just removing
those two lines, but the bug then continues to exist in the other *diff* 
programs..

Junio?

		Linus

diff --git a/diff-tree.c b/diff-tree.c
--- a/diff-tree.c
+++ b/diff-tree.c

@@ -268,8 +268,6 @@ static int call_diff_flush(void)
 		diff_flush(DIFF_FORMAT_NO_OUTPUT, 0);
 		return 0;
 	}
-	if (nr_paths)
-		diffcore_pathspec(paths);
 	if (header) {
 		if (diff_output_format == DIFF_FORMAT_MACHINE) {
 			const char *ep, *cp;