sandbox: cast to pointer from integer of different size

Building sandbox_defconfig on ARMv7 with HOST_32BIT=y results in:

drivers/misc/qfw_sandbox.c:51:25: warning:
cast to pointer from integer of different size [-Wint-to-pointer-cast]
   51 |         void *address = (void *)be64_to_cpu(dma->address);

Add the missing type conversion.

Fixes: 69512551aa84 ("test: qemu: add qfw sandbox driver, dm tests, qemu tests")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/misc/qfw_sandbox.c b/drivers/misc/qfw_sandbox.c
index b09974d..1002df7 100644
--- a/drivers/misc/qfw_sandbox.c
+++ b/drivers/misc/qfw_sandbox.c
@@ -48,7 +48,7 @@
 {
 	u16 entry;
 	u32 control = be32_to_cpu(dma->control);
-	void *address = (void *)be64_to_cpu(dma->address);
+	void *address = (void *)(uintptr_t)be64_to_cpu(dma->address);
 	u32 length = be32_to_cpu(dma->length);
 	struct qfw_sandbox_plat *plat = dev_get_plat(dev);
 	struct fw_cfg_file *file;