execute: account for -o path option count

This always works fine... until your exec() fails and you try to go and
free it, you've overwritten the allocator's metadata (and potentially other
stuff) and it fails.

Signed-off-by: Tycho Andersen <tycho@tycho.ws>

src/lxc/execute.c

@@ -57,6 +57,9 @@ static int execute_start(struct lxc_handler *handler, void* data)
 	if (lxc_log_has_valid_level())
 		argc_add += 2;
 
+	if (current_config->logfd != -1 || lxc_log_fd != -1)
+		argc_add += 2;
+
 	argv = malloc((argc + argc_add) * sizeof(*argv));
 	if (!argv) {
 		SYSERROR("Allocating init args failed");