staging: atomicsp: fix a loop timeout

It's a post-op loop so we timeout with "max_wait" set to -1, not 0.

Fixes: a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/atomisp/pci/atomisp2/atomisp_v4l2.c

@@ -411,7 +411,7 @@ void punit_ddr_dvfs_enable(bool enable)
 		}
 	}
 
-	if (max_wait == 0)
+	if (max_wait == -1)
 		pr_info("DDR DVFS, door bell is not cleared within 3ms\n");
 }