spi: core: Fix error code in spi_register_controller()

Return -ENOMEM if the allocation fails.  Don't return success.

Fixes: 6598b91b ("spi: spi.c: Convert statistics to per-cpu u64_stats_t")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/Yqh6bdNYO2XNhPBa@kiliSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -3082,6 +3082,7 @@ int spi_register_controller(struct spi_controller *ctlr)
 	ctlr->pcpu_statistics = spi_alloc_pcpu_stats(dev);
 	if (!ctlr->pcpu_statistics) {
 		dev_err(dev, "Error allocating per-cpu statistics\n");
+		status = -ENOMEM;
 		goto destroy_queue;
 	}