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Check the return value of strbuf APIs in perf-probe related code, so that it can handle errors in strbuf. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20160510054707.6158.69861.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>