arm: pmu: Improve PMU error reporting
The KVM ioctls mostly just return -1 in the error case, leaving the actual error code in errno. Change the output of the PMU error message to actually print this error code instead of the generic -1. Signed-off-by:Andre Przywara <andre.przywara@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com>
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