multiboot: Check validity of mh_header_addr
I couldn't find a case where this prevents something bad from happening that isn't already caught by other checks, but let's err on the safe side and check that mh_header_addr is as expected. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NJack Schwartz <jack.schwartz@oracle.com> (cherry picked from commit dbf2dce7) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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