9576 hid_attach is missing one mutex_exit in error path
Reviewed by: Andrew Stormont <andyjstormont@gmail.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Yuri Pankov <yuripv@yuripv.net>
Approved by: Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>

@@ -432,10 +432,11 @@
         }
 
         mutex_enter(&hidp->hid_mutex);
         if (usb_ep_xdescr_fill(USB_EP_XDESCR_CURRENT_VERSION, dip, ep_data,
             &hidp->hid_ep_intr_xdescr) != USB_SUCCESS) {
+                mutex_exit(&hidp->hid_mutex);
 
                 goto fail;
         }
 
         /*