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715634e6d1
NAND code uses either "cat" or "zcat" for getting firmware image
content. Code was full of duplicated ${gz}cat calls. Use "cmd" variable
that is determined by a caller and passed to lower level functions. This
avoids code duplication and allows adding support for more formats.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>