The regulator_disable() function can't accept NULL pointers so we need
to add a check.

Signed-off-by: Dan Carpenter <[email protected]>

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index 6f96795..abfb1cc 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -88,7 +88,8 @@ static int host_start(struct ci_hdrc *ci)
        return ret;
 
 disable_reg:
-       regulator_disable(ci->platdata->reg_vbus);
+       if (ci->platdata->reg_vbus)
+               regulator_disable(ci->platdata->reg_vbus);
 
 put_hcd:
        usb_put_hcd(hcd);
--
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