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jbig2dec: Pages without decoded images cannot be completed.

--- a/jbig2_page.c

+++ b/jbig2_page.c

@@ -188,7 +188,7 @@

 int

 jbig2_complete_page(Jbig2Ctx *ctx)

 {

-    int code = 0;

+    int code;

     /* check for unfinished segments */

     if (ctx->segment_index != ctx->n_segments) {

@@ -207,11 +207,12 @@

     }

     /* ensure image exists before marking page as complete */

-    if (!code && ctx->pages[ctx->current_page].image != NULL) {

-        ctx->pages[ctx->current_page].state = JBIG2_PAGE_COMPLETE;

+    if (ctx->pages[ctx->current_page].image == NULL) {

+        return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "page has no image, cannot be completed");

     }

-    return code;

+    ctx->pages[ctx->current_page].state = JBIG2_PAGE_COMPLETE;

+    return 0;

 }

 /**