perf thread-stack: Tidy thread_stack__push_cp() usage
If 'cp' is checked in thread_stack__push_cp() a number of error checks can be removed, reducing code size and improving readability. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20190109091835.5570-3-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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