[patch] usb: gadget: f_midi: missing unlock on error path

[Dan Carpenter]

We added a new error path to this function and we forgot to drop the
lock.

Fixes: e1e3d7ec5da3 ('usb: gadget: f_midi: pre-allocate IN requests')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/usb/gadget/function/f_midi.c 
b/drivers/usb/gadget/function/f_midi.c
index fb1fe96d..92b9ec8 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -1213,8 +1213,10 @@ static struct usb_function *f_midi_alloc(struct 
usb_function_instance *fi)
        midi->in_last_port = 0;
 
        status = kfifo_alloc(&midi->in_req_fifo, midi->qlen, GFP_KERNEL);
-       if (status)
+       if (status) {
+               mutex_unlock(&opts->lock);
                goto setup_fail;
+       }
 
        ++opts->refcnt;
        mutex_unlock(&opts->lock);
--
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