xhci: use debug level when printing out interval rounding messages

Don't use dev_warn() for intened behaviour, use dev_dbg()

Rounding down the interval to the nearest power of 2 is required
by xhci specs.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index c48cbe7..536d00f 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1245,7 +1245,7 @@
 	interval = fls(desc_interval) - 1;
 	interval = clamp_val(interval, min_exponent, max_exponent);
 	if ((1 << interval) != desc_interval)
-		dev_warn(&udev->dev,
+		dev_dbg(&udev->dev,
 			 "ep %#x - rounding interval to %d microframes, ep desc says %d microframes\n",
 			 ep->desc.bEndpointAddress,
 			 1 << interval,