KVM: allow KVM_BUG/KVM_BUG_ON to handle 64-bit cond

Current KVM_BUG and KVM_BUG_ON assume that 'cond' passed from callers is
32-bit as it casts 'cond' to the type of int. This will be wrong if 'cond'
provided by a caller is 64-bit, e.g. an error code of 0xc0000d0300000000
will be converted to 0, which is not expected.

Improves the implementation by using bool in KVM_BUG and KVM_BUG_ON.
'bool' is preferred to 'int' as __ret is essentially used as a boolean
and coding-stytle.rst documents that use of bool is encouraged to improve
readability and is often a better option than 'int' for storing boolean
values.

Fixes: 0b8f11737cff ("KVM: Add infrastructure and macro to mark VM as bugged")
Signed-off-by: Wei Wang <[email protected]>
Reviewed-by: Mingwei Zhang <[email protected]>
Reviewed-by: Sean Christopherson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

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