Revert "Fix mtr to be able to wait for >1 exited mysqld"

This reverts commit 72deed59
which was merged as commit 29d4ac2c.

The change caused regressions, such as mysql-test-run failing
to run at all with --valgrind, or aborting on Windows on the
first test failure.

mysql-test/mysql-test-run.pl

@@ -3961,32 +3961,32 @@ sub run_testcase ($$) {
   }
 
   my $test= $tinfo->{suite}->start_test($tinfo);
-  # Set to a list of processes we have to keep waiting (expectedly died servers)
-  my %keep_waiting_proc = ();
+  # Set only when we have to keep waiting after expectedly died server
+  my $keep_waiting_proc = 0;
   my $print_timeout= start_timer($print_freq * 60);
 
   while (1)
   {
     my $proc;
-    if (scalar(keys(%keep_waiting_proc)) > 0)
+    if ($keep_waiting_proc)
     {
       # Any other process exited?
       $proc = My::SafeProcess->check_any();
       if ($proc)
       {
 	mtr_verbose ("Found exited process $proc");
-	$keep_waiting_proc{$proc} = 1;
       }
       else
       {
+	$proc = $keep_waiting_proc;
 	# Also check if timer has expired, if so cancel waiting
 	if ( has_expired($test_timeout) )
 	{
-	  %keep_waiting_proc = ();
+	  $keep_waiting_proc = 0;
 	}
       }
     }
-    if (scalar(keys(%keep_waiting_proc)) == 0)
+    if (! $keep_waiting_proc)
     {
       if($test_timeout > $print_timeout)
       {
@@ -4003,19 +4003,19 @@ sub run_testcase ($$) {
       else
       {
          $proc= My::SafeProcess->wait_any_timeout($test_timeout);
-         $keep_waiting_proc{$proc} = 1;
       }
     }
 
-    if (scalar(keys(%keep_waiting_proc)) == 0)
+    # Will be restored if we need to keep waiting
+    $keep_waiting_proc = 0;
+
+    unless ( defined $proc )
     {
       mtr_error("wait_any failed");
     }
-    mtr_verbose("Got " . join(",", keys(%keep_waiting_proc)));
+    mtr_verbose("Got $proc");
 
     mark_time_used('test');
-    my $expected_exit = 1;
-    foreach $proc (keys(%keep_waiting_proc)) {
     # ----------------------------------------------------
     # Was it the test program that exited
     # ----------------------------------------------------
@@ -4129,22 +4129,11 @@ sub run_testcase ($$) {
     # Check if it was an expected crash
     # ----------------------------------------------------
     my $check_crash = check_expected_crash_and_restart($proc);
-      if ($check_crash == 0) # unexpected exit/crash of $proc
+    if ($check_crash)
     {
-        $expected_exit = 0;
-        last;
-      }
-      elsif ($check_crash == 1) # $proc was started again by check_expected_crash_and_restart()
-      {
-        delete $keep_waiting_proc{$proc};
-      }
-      elsif ($check_crash == 2) # we must keep waiting
-      {
-        # do nothing
-      }
-    }
-
-    if ($expected_exit) {
+      # Keep waiting if it returned 2, if 1 don't wait or stop waiting.
+      $keep_waiting_proc = 0 if $check_crash == 1;
+      $keep_waiting_proc = $proc if $check_crash == 2;
       next;
     }