simpleperf: fix cmd_debug_unwind tests.

Without flushing stdout, the tests may fail when
running `adb shell simpleperf_unit_test`.

Bug: none
Test: run `adb shell simpleperf_unit_test`.
Change-Id: I8bcf739e7672e8affc71df0a3f11264c0bd7f745

1 files changed, 2 insertions, 0 deletions

diff --git a/simpleperf/cmd_debug_unwind_test.cpp b/simpleperf/cmd_debug_unwind_test.cpp
index 8bf93d32..153adb75 100644
--- a/simpleperf/cmd_debug_unwind_test.cpp
+++ b/simpleperf/cmd_debug_unwind_test.cpp
@@ -45,6 +45,7 @@ class CaptureStdout {
   }
 
   bool Start() {
+    fflush(stdout);
     old_stdout_ = dup(STDOUT_FILENO);
     if (old_stdout_ == -1) {
       return false;
@@ -58,6 +59,7 @@ class CaptureStdout {
   }
 
   std::string Finish() {
+    fflush(stdout);
     started_ = false;
     dup2(old_stdout_, STDOUT_FILENO);
     close(old_stdout_);