Make iscsictl(8) actually report non-zero status on errors. The "failed"

is negative, because the error returned from calls to ioctl(2) is negative.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation

usr.bin/iscsictl/iscsictl.c

@@ -987,7 +987,7 @@ main(int argc, char **argv)
 	if (error != 0)
 		xo_err(1, "close");
 
-	if (failed > 0)
+	if (failed != 0)
 		return (1);
 
 	xo_close_container("iscsictl");