perf test: test_intel_pt.sh: Fix return checking

The use of set -e will cause a function that returns non-zero to terminate
the script unless the result is consumed by || for example. That is OK if
there is only 1 test function, but not if there are more. Prepare for more
by using ||.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220912083412.7058-9-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/test_intel_pt.sh

@@ -72,11 +72,11 @@ count_result()
 		return
 	fi
 	err_cnt=$((err_cnt + 1))
+	ret=0
 }
 
-test_system_wide_side_band
-
-count_result $?
+ret=0
+test_system_wide_side_band || ret=$? ; count_result $ret
 
 cleanup