cfg80211: mlme: Silently ignore duplicate management registrations

Instead of erroring out, just ignore the call

Change-Id: I5ff67100ea2d7f53bd30b6844c462bca71c24d15
net/l2tp: don't fall back on UDP [get|set]sockopt

The l2tp [get|set]sockopt() code has fallen back to the UDP functions
for socket option levels != SOL_PPPOL2TP since day one, but that has
never actually worked, since the l2tp socket isn't an inet socket.

As David Miller points out:

  "If we wanted this to work, it'd have to look up the tunnel and then
   use tunnel->sk, but I wonder how useful that would be"

Since this can never have worked so nobody could possibly have depended
on that functionality, just remove the broken code and return -EINVAL.

Change-Id: Ia6c09487e92d1ee4e8d1d22a6273034b22272a2f
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: James Chapman <jchapman@katalix.com>
Acked-by: David Miller <davem@davemloft.net>
Cc: Phil Turnbull <phil.turnbull@oracle.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
MSM8974: Fix build errors/warnings:
	ambiguity of ret causing -Wsequence-point error
	arguments to sizeof in memcpy/memset calls of the same pointer type
Change-Id: Ia851b2dea8e353db6231cfd1abfd535d49e03b7a
My defconfigs & Perf
msm: mdss: Add lcd notifier