usb: musb: core: Handle Babble condition only in HOST mode

BABBLE and RESET share the same interrupt. The interrupt
is considered to be RESET if MUSB is in peripheral mode and
as a BABBLE if MUSB is in HOST mode.

Handle babble condition iff MUSB is in HOST mode.

Fixes: ca88fc2ef0d7 (usb: musb: add a work_struct to recover from babble errors)
Tested-by: Tony Lindgren <[e-mail]>
Signed-off-by: George Cherian <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/musb/musb_core.c

···
 	}
 
 	/* handle babble condition */
-	if (int_usb & MUSB_INTR_BABBLE)
+	if (int_usb & MUSB_INTR_BABBLE && is_host_active(musb))
 		schedule_work(&musb->recover_work);
 
 #if 0