fix: ignore EINVAL (for qemu builds)

Signed-off-by: Ramkumar Chinchani <[email protected]>

Author: rchincha

cmd/stacker/lxc-wrapper/lxc-wrapper.c

@@ -186,7 +186,7 @@ static int do_nsexec(char* mode, int argc, char *argv[], int *status)
 	args.command_start = command_start;
 
 	pid = clone(childFunc, child_stack + STACK_SIZE, flags | SIGCHLD, &args);
-	if (pid < 0) {
+	if ((pid < 0) && (pid != -EINVAL)) {
 		close(args.sk_pair[0]);
 		close(args.sk_pair[1]);
 		fprintf(stderr, "fork(): %m\n");