Quoting variables prevents word splitting and glob expansion, and
prevents the script from breaking when input contains spaces, line
feeds, glob characters and such.
See shellcheck warning SC2086.
Change-Id: I7256d2fc2a22bce7723950a534fef6d57cbd097f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12761
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>