perf pmu: Reduce scope of perf_pmu_error()

Move declaration from header file to pmu.y and make static.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230823080828.1460376-5-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/pmu.h

@@ -227,7 +227,6 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
 			  struct perf_pmu_info *info);
 struct list_head *perf_pmu__alias(struct perf_pmu *pmu,
 				  struct list_head *head_terms);
-void perf_pmu_error(struct list_head *list, char *name, void *scanner, char const *msg);
 
 int perf_pmu__new_format(struct list_head *list, char *name,
 			 int config, unsigned long *bits);

tools/perf/util/pmu.y

@@ -21,6 +21,8 @@ do { \
                 YYABORT; \
 } while (0)
 
+static void perf_pmu_error(struct list_head *list, char *name, void *scanner, char const *msg);
+
 static void perf_pmu__set_format(unsigned long *bits, long from, long to)
 {
 	long b;
@@ -93,7 +95,7 @@ PP_VALUE
 
 %%
 
-void perf_pmu_error(struct list_head *list __maybe_unused,
+static void perf_pmu_error(struct list_head *list __maybe_unused,
 		    char *name __maybe_unused,
 		    void *scanner __maybe_unused,
 		    char const *msg __maybe_unused)