perf annotate: Remove redundant 'ret' variable

Return the result from hist_entry_iter__add() directly instead of taking
this in another redundant variable.
Signed-off-by: Ntangmeng <tangmeng@uniontech.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20220216030425.27779-1-tangmeng@uniontech.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-annotate.c

@@ -194,7 +194,6 @@ static int process_branch_callback(struct evsel *evsel,
 	};
 
 	struct addr_location a;
-	int ret;
 
 	if (machine__resolve(machine, &a, sample) < 0)
 		return -1;
@@ -207,8 +206,7 @@ static int process_branch_callback(struct evsel *evsel,
 
 	hist__account_cycles(sample->branch_stack, al, sample, false, NULL);
 
-	ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
-	return ret;
+	return hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
 }
 
 static bool has_annotation(struct perf_annotate *ann)