buildgcc: Fix color output in download_showing_percentage

Probably this was never tested as the return to no color "\033[0m"
was printed verbatim.

Change-Id: I7e6e1049b062ffb138ebdaeb62ddc49581ff8db1
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/19811
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/crossgcc/buildgcc

@@ -901,7 +901,7 @@ if searchtool wget "GNU" nofail > /dev/null; then
 		wget $url 2>&1 | while read line; do
 			echo $line | grep -o "[0-9]\+%" | awk '{printf("\b\b\b\b%4s", $1)}'
 		done
-		echo "${NC}"
+		printf "${NC}"
 	}
 elif searchtool curl "^curl " > /dev/null; then
 	download_showing_percentage() {