i3c: fix an error code in i3c_master_add_i3c_dev_locked()

We should return "ret" as-is.  The "newdev" variable is a valid pointer.

Change-Id: Ic7196271dc547363e899adb46be86e36af4fc92d
Fixes: 3a379bbc ("i3c: Add core I3C infrastructure")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Git-commit: 840414ae
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Alok Chauhan <alokc@codeaurora.org>