xhci: xhci_mem_cleanup: make sure cmd_ring_reserved_trbs really is 0

cmd_ring_reserved_trbs gets decremented by xhci_free_stream_info(), so set it
to 0 after freeing all rings, otherwise it wraps around to a very large value
when rings with streams are free-ed.

Before this patch the wrap-around could be triggered when xhci_resume
calls xhci_mem_cleanup if the controller resume fails.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/host/xhci-mem.c

@@ -1812,7 +1812,6 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
 
 	if (xhci->lpm_command)
 		xhci_free_command(xhci, xhci->lpm_command);
-	xhci->cmd_ring_reserved_trbs = 0;
 	if (xhci->cmd_ring)
 		xhci_ring_free(xhci, xhci->cmd_ring);
 	xhci->cmd_ring = NULL;
@@ -1877,6 +1876,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
 	}
 
 no_bw:
+	xhci->cmd_ring_reserved_trbs = 0;
 	xhci->num_usb2_ports = 0;
 	xhci->num_usb3_ports = 0;
 	xhci->num_active_eps = 0;