mxssb: Remove assignment of variable into itself

This was a result of shuffling the code around, remove this useless
line.
Signed-off-by: Marek Vasut <marex@denx.de>

mxssb.c

@@ -742,7 +742,6 @@ static int sb_build_command_load(struct sb_image_ctx *ictx, struct sb_cmd_list *
 		if (ret) {
 			fprintf(stderr, "#%i ERR: Cannot load '%s'!\n",
 				cmd->lineno, tok);
-			ret = ret;
 			goto err;
 		}
 	}