r600g: remove an unused parameter from r600_bo_destroy

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/src/gallium/winsys/r600/drm/r600_priv.h b/src/gallium/winsys/r600/drm/r600_priv.h
index 82deeb8..df412a0 100644
--- a/src/gallium/winsys/r600/drm/r600_priv.h
+++ b/src/gallium/winsys/r600/drm/r600_priv.h
@@ -105,13 +105,8 @@
 	if (reloc_index >= ctx->creloc)
 		ctx->creloc = reloc_index+1;
 
-	r600_bo_reference(ctx->radeon, &ctx->bo[reloc_index], rbo);
+	r600_bo_reference(&ctx->bo[reloc_index], rbo);
 	return reloc_index * 4;
 }
 
-/*
- * r600_bo.c
- */
-void r600_bo_destroy(struct radeon *radeon, struct r600_bo *bo);
-
 #endif