Fix a missing early-return in Table::get (#1652)

Turns out this was a typo from #1016!

tests/all/main.rs

@@ -14,6 +14,7 @@ mod linker;
 mod memory_creator;
 mod name;
 mod stack_overflow;
+mod table;
 mod traps;
 mod use_after_drop;
 mod wast;