perf session: Introduce reader EOF function

Introduce function to check end-of-file status.
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Antonov <alexander.antonov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Link: https://lore.kernel.org/r/b3b0e0904da01f9ec84d4ae9368df99ecd231598.1634113027.git.alexey.v.bayduraev@linux.intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/session.c

@@ -2314,6 +2314,12 @@ reader__read_event(struct reader *rd, struct perf_session *session,
 	return err;
 }
 
+static inline bool
+reader__eof(struct reader *rd)
+{
+	return (rd->file_pos >= rd->data_size + rd->data_offset);
+}
+
 static int
 reader__process_events(struct reader *rd, struct perf_session *session,
 		       struct ui_progress *prog)
@@ -2341,7 +2347,7 @@ reader__process_events(struct reader *rd, struct perf_session *session,
 	if (session_done())
 		goto out;
 
-	if (rd->file_pos < rd->data_size + rd->data_offset)
+	if (!reader__eof(rd))
 		goto more;
 
 out: