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Bug 694249: Fix JBig2Dec using broken image regions.

When decoding a "generic immediate region" in jbig2dec, if
we detect an error, we should not use the image as it may not
have been entirely initialised.

--- a/jbig2_generic.c

+++ b/jbig2_generic.c

@@ -909,8 +909,12 @@

 					 as, image, GB_stats);

     }

-  jbig2_page_add_result(ctx, &ctx->pages[ctx->current_page],

-			image, rsi.x, rsi.y, rsi.op);

+  if (code >= 0)

+    jbig2_page_add_result(ctx, &ctx->pages[ctx->current_page],

+			  image, rsi.x, rsi.y, rsi.op);

+  else

+    jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

+		"error while decoding immediate_generic_region");

 cleanup:

   jbig2_free(ctx->allocator, as);