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If compiling -current without debugging enabled, this module fails with
a warning about unused variables (warnings treated as errors).

The attached patch allows compilation to proceed although I'm not
convinced that it's entirely correct (duplicate evaluation of
device_get_ivars()),

        imb
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Index: sys/dev/siba/siba_core.c
===================================================================
--- sys/dev/siba/siba_core.c	(revision 204990)
+++ sys/dev/siba/siba_core.c	(working copy)
@@ -2031,11 +2031,8 @@
 uint32_t
 siba_dma_translation(device_t dev)
 {
-	struct siba_dev_softc *sd = device_get_ivars(dev);
-	struct siba_softc *siba = sd->sd_bus;
-
-	KASSERT(siba->siba_type == SIBA_TYPE_PCI,
-	    ("unsupported bustype %d\n", siba->siba_type));
+	KASSERT(device_get_ivars(dev)->sd_bus->siba_type == SIBA_TYPE_PCI,
+	    ("unsupported bustype %d\n", device_get_ivars(dev)->sd_bus->siba_type));
 	return (SIBA_PCI_DMA);
 }
 
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