qed: don't pass NULL to memcpy
Spotted by Clang Analyzer [Note this memcpy call has always been safe because the length will be 0 when the pointer is NULL] Signed-off-by: NPavel Borzenkov <pavel.borzenkov@gmail.com> Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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