John Baldwin 304050dde0 Hold GIF_LOCK() for almost all of gif_start(). It is required to be held
across in_gif_output() and in6_gif_output() anyway, and once it is held
across those it might as well be held for the entire loop.  This simplifies
the code and removes the need for the custom IFF_GIF_WANTED flag (which
belonged in the softc and not as an IFF_* flag anyway).

Tested by:	Vincent Hoffman  vince  unsane co uk
2012-06-29 15:21:34 +00:00
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