perf evlist: Fix the class prefix for 'struct evlist' strerror methods

To differentiate from libperf's 'struct perf_evlist' methods.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/code-reading.c

@@ -678,7 +678,7 @@ static int do_test_code_reading(bool try_kcore)
 
 			if (verbose > 0) {
 				char errbuf[512];
-				perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
+				evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
 				pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
 			}