Revert "Bluetooth: fix use-after-free in accessing skb after sending it"

This reverts commit 715264ad which is
commit 947ec0d0 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Icc979230a67566ee6a64cee43c91ec710c53c019
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>