[tools] testbot/TestAgent: The maximum alarm() value is signed.

[Francois Gouget]

And still 32-bit.

Signed-off-by: Francois Gouget 
---
 testbot/lib/WineTestBot/TestAgent.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/testbot/lib/WineTestBot/TestAgent.pm b/testbot/lib/WineTestBot/TestAgent.pm
index fea7e650e1..b395cf2d26 100644
--- a/testbot/lib/WineTestBot/TestAgent.pm
+++ b/testbot/lib/WineTestBot/TestAgent.pm
@@ -267,8 +267,8 @@ sub _SetAlarm($)
   {
     my $Timeout = $self->{deadline} - time();
     die "timeout" if ($Timeout <= 0);
-    # alarm() has a 32-bit limit, even on 64-bit systems
-    alarm($Timeout <= 0xffffffff ? $Timeout : 0xffffffff);
+    # alarm() has a signed 32-bit limit, even on 64-bit systems
+    alarm($Timeout <= 0x7fffffff ? $Timeout : 0x7fffffff);
   }
 }