commands: digest: show area info only if necessary
Area info "0x00000000 ... 0xffffffffffffffff" in digest
commands output is something strange and misleading, e.g.
barebox@barebox sandbox:/ md5sum logo/barebox-logo-240.png
d3226a0eba3fd49af6bd190b077a3466 logo/barebox-logo-240.png 0x00000000 ... 0xffffffffffffffff
Also skipping area info in the barebox digets commands
output for every file makes it more similar to traditional
*nix digest commands output.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>