perf config: Check error cases of {show_spec, set}_config()
show_spec_config() and set_config() can be called multiple times in the loop in cmd_config(). However, The error cases of them wasn't checked, so fix it. Reported-by: NArnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: NTaeung Song <treeze.taeung@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1497671197-20450-1-git-send-email-treeze.taeung@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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