Merge r596 from branches/5.0: row_sel_try_search_shortcut(): Do not return

SEL_FOUND when the record was not found.  This bug was introduced in
MySQL/InnoDB 5.0.3, but luckily it should never manifest itself, given
that existing InnoDB SQL code never makes use of consistent reads.

row/row0sel.c

@@ -1135,11 +1135,12 @@ row_sel_try_search_shortcut(
 	ut_ad(plan->pcur.latch_mode == node->latch_mode);
 
 	plan->n_rows_fetched++;
+	ret = SEL_FOUND;
 func_exit:
 	if (UNIV_LIKELY_NULL(heap)) {
 		mem_heap_free(heap);
 	}
-	return(SEL_FOUND);
+	return(ret);
 }
 
 /*************************************************************************