[wasm] Break a decoder loop if there is a failure.

src/wasm/module-decoder.cc

Index: src/wasm/module-decoder.cc
diff --git a/src/wasm/module-decoder.cc b/src/wasm/module-decoder.cc
index c47aa351a3409209e7425989dda2314db8cbe815..0aa620722949803b3e733159b5ea10d50a24cea9 100644
--- a/src/wasm/module-decoder.cc
+++ b/src/wasm/module-decoder.cc
@@ -164,6 +164,7 @@ class ModuleDecoder : public Decoder {
           uint32_t functions_count = consume_u32v("functions count");
           module->functions.reserve(SafeReserve(functions_count));
           for (uint32_t i = 0; i < functions_count; ++i) {
+            if (failed()) break;
             module->functions.push_back({nullptr,  // sig
                                          i,        // func_index
                                          0,        // sig_index