travis-ci: printf $STATUS as string

If the $STATUS variable contains a "%" character then printf will
interpret that as invalid format string. Fix this by formatting $STATUS
as string.
Signed-off-by: NLars Schneider <larsxschneider@gmail.com>
Acked-by: NJohannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

ci/run-windows-build.sh

@@ -55,7 +55,7 @@ while true
 do
 	LAST_STATUS=$STATUS
 	STATUS=$(gfwci "action=status&buildId=$BUILD_ID")
-	test "$STATUS" = "$LAST_STATUS" || printf "\nStatus: $STATUS "
+	test "$STATUS" = "$LAST_STATUS" || printf "\nStatus: %s " "$STATUS"
 	printf "."
 
 	case "$STATUS" in