t: local VAR="VAL" (quote positional parameters)

Future-proof test scripts that do

	local VAR=VAL

without quoting VAL (which is OK in POSIX but broken in some shells)
that is a positional parameter, e.g. $4.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/test-lib-functions.sh

@@ -1765,7 +1765,7 @@ test_parse_ls_tree_oids () {
 # Choose a port number based on the test script's number and store it in
 # the given variable name, unless that variable already contains a number.
 test_set_port () {
-	local var=$1 port
+	local var="$1" port
 
 	if test $# -ne 1 || test -z "$var"
 	then