perf inject: Fix use without initialization of local variables

Local variables were missing initialization and command line
processing didn't provide default values.

Fixes: 64eed01 ("perf inject: Lazy build-id mmap2 event insertion")
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
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>
Link: https://lore.kernel.org/r/20241211060831.806539-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: captain5050

tools/perf/builtin-inject.c

@@ -2367,10 +2367,10 @@ int cmd_inject(int argc, const char **argv)
 	};
 	int ret;
 	const char *known_build_ids = NULL;
-	bool build_ids;
-	bool build_id_all;
-	bool mmap2_build_ids;
-	bool mmap2_build_id_all;
+	bool build_ids = false;
+	bool build_id_all = false;
+	bool mmap2_build_ids = false;
+	bool mmap2_build_id_all = false;
 
 	struct option options[] = {
 		OPT_BOOLEAN('b', "build-ids", &build_ids,