perf report: Prevent segfault with --no-parent
Prevent a perf report segfault with the (non sensical) --no-parent option Signed-off-By: Andi Kleen <ak@linux.intel.com> Acked-by: Namhyung <namhyung@kernel.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20240130185552.150578-1-ak@linux.intel.com
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