clone.sh: Avoid using && operator as it may swallow errors

"cmd1 && cmd2" would swallow errors in cmd1 and let the script continue
regardless of "set -e" setting, something we don't want.

Related to TFC-352.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Iea0c56c225391bbafa078b5b1f4df625d88f4532
1 file changed