megasas: always store SCSIRequest* into MegasasCmd
This ensures that the request is unref'ed properly, and avoids a segmentation fault in the new qtest testcase that is added. This is CVE-2017-9503. Reported-by: NZhangyanyu <zyy4013@stu.ouc.edu.cn> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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