torture: Fix incorrectly redirected "exit" in kvm-remote.sh

The "exit 4" in kvm-remote.sh is pointlessly redirected, so this commit
removes the redirection.

Fixes: 0092eae ("torture: Add kvm-remote.sh script for distributed rcutorture test runs")
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

Author: paulmckrcu

tools/testing/selftests/rcutorture/bin/kvm-remote.sh

@@ -144,7 +144,7 @@ do
 	if test "$ret" -ne 0
 	then
 		echo System $i unreachable, giving up. | tee -a "$oldrun/remote-log"
-		exit 4 | tee -a "$oldrun/remote-log"
+		exit 4
 	fi
 done