powerpc/nvram: Fix a memory leak in err path
If kmemdup fails, We need kfree *buff* first then return -ENOMEM. Otherwise there is a memory leak. Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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