Following warnings and errors noticed while building perf x86_64,

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

Build log: --------- arch/x86/tests/amd-ibs-via-core-pmu.c: In function 'test__amd_ibs_via_core_pmu': arch/x86/tests/amd-ibs-via-core-pmu.c:47:25: error: 'pmus' undeclared (first use in this function) 47 | if (list_empty(&pmus)) | ^~~~ arch/x86/tests/amd-ibs-via-core-pmu.c:47:25: note: each undeclared identifier is reported only once for each function it appears in arch/x86/tests/amd-ibs-via-core-pmu.c:48:17: error: implicit declaration of function 'perf_pmu__scan'; did you mean 'perf_pmus__scan'? [-Werror=implicit-function-declaration] 48 | perf_pmu__scan(NULL); | ^~~~~~~~~~~~~~ | perf_pmus__scan arch/x86/tests/amd-ibs-via-core-pmu.c:50:19: error: implicit declaration of function 'perf_pmu__find'; did you mean 'perf_pmus__find'? [-Werror=implicit-function-declaration] 50 | ibs_pmu = perf_pmu__find("ibs_op"); | ^~~~~~~~~~~~~~ | perf_pmus__find arch/x86/tests/amd-ibs-via-core-pmu.c:50:17: error: assignment to 'struct perf_pmu *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion] 50 | ibs_pmu = perf_pmu__find("ibs_op"); | ^ cc1: all warnings being treated as errors

Links: ====== - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230606/tes... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230606/tes...

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