Fix potential memory leak in insert_native_symbol (#3712)

core/iwasm/compilation/aot_llvm.c

@@ -3288,6 +3288,7 @@ insert_native_symbol(AOTCompContext *comp_ctx, const char *symbol, int32 idx)
     bh_assert(strlen(symbol) <= sizeof(sym->symbol));
     ret = snprintf(sym->symbol, sizeof(sym->symbol), "%s", symbol);
     if (ret < 0 || ret + 1 > (int)sizeof(sym->symbol)) {
+        wasm_runtime_free(sym);
         aot_set_last_error_v("symbol name too long: %s", symbol);
         return false;
     }