Invert logic for the single-pass in swScale() functions.
Instead of having a firstTime variable defaulting to 1, have a warnedAlready defaulting to 0. While this should make no difference in code speed at runtime, it allows to aggregate the four bytes of that variable with clip_table in .bss section, rather than issuing a .data section just for that. As it is, libswscale require no .data section but .data.rel.ro (that can be mitigated by prelinking), so the change might actually save one page of memory at runtime (per process). Originally committed as revision 27734 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
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