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jbig2dec: Stripe offsets are absolute, not relative.

--- a/jbig2_page.c

+++ b/jbig2_page.c

@@ -267,7 +267,7 @@

     /* grow the page to accommodate a new stripe if necessary */

     if (page->striped && page->height == 0xFFFFFFFF) {

-        uint32_t new_height = y + image->height + page->end_row;

+        uint32_t new_height = y + image->height;

         if (page->image->height < new_height) {

             Jbig2Image *resized_image = NULL;

@@ -281,7 +281,7 @@

         }

     }

-    code = jbig2_image_compose(ctx, page->image, image, x, y + page->end_row, op);

+    code = jbig2_image_compose(ctx, page->image, image, x, y, op);

     if (code < 0)

         return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1, "failed to compose image with page");