[wasm][fuzzer] Return early if element segment offset init. fails

Bug: chromium:1103839
Change-Id: Id70b4632fb15cb16c16cb94ad0f7676e5293769d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2307311Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68945}

src/wasm/module-decoder.cc

@@ -2030,6 +2030,10 @@ class ModuleDecoderImpl : public Decoder {
 
     if (*status == WasmElemSegment::kStatusActive) {
       *offset = consume_init_expr(module_.get(), kWasmI32);
+      if (offset->kind() == WasmInitExpr::kNone) {
+        // Failed to parse offset initializer, return early.
+        return;
+      }
     }
 
     if (*status == WasmElemSegment::kStatusActive && !has_table_index) {