Fix bug #1592605: check_ping times out

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1559 f882894a-f735-0410-b71e-b25c423dba1c

plugins/check_ping.c

@@ -104,7 +104,7 @@ main (int argc, char **argv)
 	}
 
 	/* handle timeouts gracefully */
-	alarm (timeout_interval);
+	alarm (timeout_interval + 1);
 
 	for (i = 0 ; i < n_addresses ; i++) {