perf annotate: Check return value of evsel__get_arch() properly

perf annotate: Check return value of evsel__get_arch() properly

Check the error code of evsel__get_arch() in the symbol__annotate().
Previously it checked non-zero value but after the refactoring it does
only for negative values.

Fixes: 0669729eb0afb0cf ("perf annotate: Factor out evsel__get_arch()")
Suggested-by: James Clark <james.clark@linaro.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tianyou Li <tianyou.li@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>