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Fix 699142: Adaptive pixels can not be pixel to be predicted.

The fix for 699127 didn't account for the adaptive pixel location
being that of the pixel to be predicted. This is of course invalid,
and this is now recitified.

--- a/jbig2_generic.c

+++ b/jbig2_generic.c

@@ -112,7 +112,7 @@

 }

 #define pixel_outside_field(x, y) \

-    ((y) < -128 || (y) > 0 || (x) < -128 || ((y) < 0 && (x) > 127) || ((y) == 0 && (x) > 0))

+    ((y) < -128 || (y) > 0 || (x) < -128 || ((y) < 0 && (x) > 127) || ((y) == 0 && (x) >= 0))

 static int

 jbig2_decode_generic_template0_unopt(Jbig2Ctx *ctx,