uwb: avoid radio controller reset loops

If a radio controller reset attempt occurs while a probe() or remove()
is in progress it fails and is retried endlessly, potentially preventing
the probe() or remove() from completing.

If a reset fails, sleep for a bit before retrying the reset.  This
allows the probe()/remove() to complete.

Signed-off-by: David Vrabel <david.vrabel@csr.com>

drivers/uwb/whc-rc.c

@@ -443,8 +443,7 @@ static int whcrc_post_reset(struct umc_dev *umc)
 	struct whcrc *whcrc = umc_get_drvdata(umc);
 	struct uwb_rc *uwb_rc = whcrc->uwb_rc;
 
-	uwb_rc_post_reset(uwb_rc);
-	return 0;
+	return uwb_rc_post_reset(uwb_rc);
 }
 
 /* PCI device ID's that we handle [so it gets loaded] */