dibs: Check correct variable in dibs_init()

There is a typo in this code.  It should check "dibs_class" instead of
"&dibs_class".  Remove the &.

Fixes: 80473734 ("dibs: Create class dibs")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/aNP-XcrjSUjZAu4a@stanley.mountain


Signed-off-by: Jakub Kicinski <kuba@kernel.org>