Revert "rtlwifi_new: Fix oops when allocate skb fails"

This reverts commit 989a4985762e82588341f77e5ca5738a6c4062ff.
rtlwifi_new: A better fix for skb allocation failure

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtlwifi_new: Fix warnings in kernel 3.19 and newer

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>