git-p4: fix copy detection test

File file11 is copied from file2 and diff-tree correctly reports
this file as its the source. But it is possible that the diff-tree
algorithm detects file10, which was also copied from file2, as the
origin of the new file.

This fix uses a case statement to support both files as the source
of file11, as was done in other tests in this file.

Signed-off-by: Vitor Antunes <vitor.hda@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9814-git-p4-rename.sh

@@ -163,7 +163,10 @@ test_expect_success 'detect copies' '
 		git commit -a -m "Copy file2 to file11" &&
 		git diff-tree -r -C --find-copies-harder HEAD &&
 		src=$(git diff-tree -r -C --find-copies-harder HEAD | sed 1d | cut -f2) &&
-		test "$src" = file10 &&
+		case "$src" in
+		file2 | file10) : ;; # happy
+		*) false ;; # not
+		esac &&
 		git config git-p4.detectCopiesHarder true &&
 		git p4 submit &&
 		p4 filelog //depot/file11 &&