trivial patches: Should we care about control reaches end of non-void function

[Steve Kemp <steve@steve.org.uk>]

  During my build processes I see a lot of messages like this:

  In function xxx:
 xxx.c:123: control reaches end of non-void function

  These are typically caused by constructs like:

    static int some_function()
    {
        switch (blah) {
        ...

        default:
            BUG();
        }
    }

  I see some functions in the kernel have added "return 0" after the
 BUG, presumably to silence these warnings.  Would a patch to do this
 consistently, or is that too trivial even for trivial patches?

  Actual example:
    ./mm/mempolicy.c
        policy_zonelist - gives this warning.
        slab_node       - gives this warning
        __mpol_equal    - has the warning silenced via explicit return.

Steve
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