USB: gadget: gr_udc: fix memory leak with using debugfs_lookup()

USB: gadget: gr_udc: fix memory leak with using debugfs_lookup()

[ Upstream commit 5560f020fb5d0c7f9986e76f1a0399f57b847bd2 ]

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

Cc: Jakob Koschel <jakobkoschel@gmail.com>
Link: https://lore.kernel.org/r/20230202153235.2412790-8-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>