cmd_mmc: use common usage function
Rather than using a custom "Usage:", use the common cmd_usage() function,
and tail into it now that it returns 1 for us.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
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Rather than using a custom "Usage:", use the common cmd_usage() function,
and tail into it now that it returns 1 for us.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>