cxl/mem: Correct full ID range allocation

For ID allocations we want 0-(max-1), ie: smatch complains:

	 error: Calling ida_alloc_range() with a 'max' argument which is a power of 2. -1 missing?

Correct this and also replace the call to use the max() flavor instead.

Signed-off-by: Davidlohr Bueso <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dan Williams <[email protected]>

Author: Davidlohr Bueso

drivers/cxl/core/memdev.c

@@ -242,7 +242,7 @@ static struct cxl_memdev *cxl_memdev_alloc(struct cxl_dev_state *cxlds,
 	if (!cxlmd)
 		return ERR_PTR(-ENOMEM);
 
-	rc = ida_alloc_range(&cxl_memdev_ida, 0, CXL_MEM_MAX_DEVS, GFP_KERNEL);
+	rc = ida_alloc_max(&cxl_memdev_ida, CXL_MEM_MAX_DEVS - 1, GFP_KERNEL);
 	if (rc < 0)
 		goto err;
 	cxlmd->id = rc;