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Fix memory leak on nvram_open() and nvram_open_rdonly(). For nvram_open(), the 'fd' should be closed on error, and mmap_area should be unmap when nvram magic can not be found. For nvram_open_rdonly(), the 'file' variable should free before return. Once nvram_find_mtd() return successfully, it will allocate memory to save mtd device string. Signed-off-by: BangLang Huang <banglang.huang@foxmail.com>