mwifiex: usb: handle HS failures

SDIO and PCIe drivers handle this. Let's imitate it.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Tested-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/usb.c

@@ -521,7 +521,14 @@ static int mwifiex_usb_suspend(struct usb_interface *intf, pm_message_t message)
 		mwifiex_dbg(adapter, WARN,
 			    "Device already suspended\n");
 
-	mwifiex_enable_hs(adapter);
+	/* Enable the Host Sleep */
+	if (!mwifiex_enable_hs(adapter)) {
+		mwifiex_dbg(adapter, ERROR,
+			    "cmd: failed to suspend\n");
+		adapter->hs_enabling = false;
+		return -EFAULT;
+	}
+
 
 	/* 'is_suspended' flag indicates device is suspended.
 	 * It must be set here before the usb_kill_urb() calls. Reason