staging: rtl8723bs: core: fix warning Comparison to NULL

this patch fixes "Comparison to NULL" warnings reported by
checkpatch

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hariprasad Kelam 2019-05-30 23:28:00 +05:30 • committed by Greg Kroah-Hartman
commit d8210b1132