usb: gadget: don't release an existing dev->buf

usb: gadget: don't release an existing dev->buf

commit 89f3594d0de58e8a57d92d497dea9fee3d4b9cda upstream.

dev->buf does not need to be released if it already exists before
executing dev_config.

Mot-CRs-fixed: (CR)
CVE-Fixed: CVE-2022-24958
Bug: 220261709

Change-Id: I0eb72bf758a7909ce31e2aa960ed0583b1632a95
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Link: https://lore.kernel.org/r/20211231172138.7993-2-hbh25y@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Gajjala Chakradhar <gajjalac@motorola.com>
Reviewed-on: https://gerrit.mot.com/2276113
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key