KVM: x86: zero base3 of unusable segments

commit f0367ee1 upstream.

Static checker noticed that base3 could be used uninitialized if the
segment was not present (useable).  Random stack values probably would
not pass VMCS entry checks.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 1aa36616 ("KVM: x86 emulator: consolidate segment accessors")
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>