nanddump: don't leak copied command line arguments
For some command line flags, the argument string is copied. Simply
writing over the buffer leads to a resource leak if the same flag
is specified on the command line more than once.
This patch adds a free() call to the old buffer before overwriting
it with the new copy.
Signed-off-by:
David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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