git-p4: remove bash-ism in t9809

Plain old $# works to count the number of arguments in
either bash or dash, even if the arguments have spaces.
Based-on-patch-by: NVitor Antunes <vitor.hda@gmail.com>
Signed-off-by: NPete Wyckoff <pw@padd.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t9809-git-p4-client-view.sh

@@ -31,7 +31,7 @@ client_view() {
 #
 check_files_exist() {
 	ok=0 &&
-	num=${#@} &&
+	num=$# &&
 	for arg ; do
 		test_path_is_file "$arg" &&
 		ok=$(($ok + 1))