intelspi: fix "Device leaked IRQ resources"

[Yuri Pankov]

A simple fix for an obvious typo, leading to "Device leaked IRQ 
resources" on attach failure or detach.
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diff --git a/sys/dev/intel/spi.c b/sys/dev/intel/spi.c
index 9b229bb74123..575240fc3167 100644
--- a/sys/dev/intel/spi.c
+++ b/sys/dev/intel/spi.c
@@ -480,7 +480,7 @@ intelspi_attach(device_t dev)
 		    sc->sc_mem_rid, sc->sc_mem_res);
 
 	if (sc->sc_irq_res != NULL)
-		bus_release_resource(dev, SYS_RES_MEMORY,
+		bus_release_resource(dev, SYS_RES_IRQ,
 		    sc->sc_irq_rid, sc->sc_irq_res);
 
 	return (ENXIO);
@@ -503,7 +503,7 @@ intelspi_detach(device_t dev)
 		    sc->sc_mem_rid, sc->sc_mem_res);
 
 	if (sc->sc_irq_res != NULL)
-		bus_release_resource(dev, SYS_RES_MEMORY,
+		bus_release_resource(dev, SYS_RES_IRQ,
 		    sc->sc_irq_rid, sc->sc_irq_res);
 
 	return (0);