[bootstrap] Fix Missing Conditional in CHECK

Signed-off-by: Sam Elliott <selliott@lowrisc.org>
diff --git a/sw/device/boot_rom/bootstrap.c b/sw/device/boot_rom/bootstrap.c
index bd26b91..76f0475 100644
--- a/sw/device/boot_rom/bootstrap.c
+++ b/sw/device/boot_rom/bootstrap.c
@@ -158,7 +158,7 @@
             (dif_spi_device_params_t){
                 .base_addr = mmio_region_from_addr(0x40020000),
             },
-            &spi),
+            &spi) == kDifSpiDeviceOk,
         "Failed to initialize SPI.");
   CHECK(
       dif_spi_device_configure(&spi,