Merge branch 'tun-debug'

Michal Kubecek says:

====================
tun: debug messages cleanup

While testing ethtool output for "strange" devices, I noticed confusing and
obviously incorrect message level information for a tun device and sent
a quick fix. The result of the upstream discussion was that tun driver
would rather deserve a more complex cleanup of the way it handles debug
messages.

The main problem is that all debugging statements and setting of message
level are controlled by TUN_DEBUG macro which is only defined if one edits
the source and rebuilds the module, otherwise all DBG1() and tun_debug()
statements do nothing.

This series drops the TUN_DEBUG switch and replaces custom tun_debug()
macro with standard netif_info() so that message level (mask) set and
displayed using ethtool works as expected. Some debugging messages are
dropped as they only notify about entering a function which can be done
easily using ftrace or kprobe.

Patch 1 is a trivial fix for compilation warning with W=1.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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